I've been working on a theory regarding Ventus that could ultimately destroy the line of logic of why he's not aging in Castle Oblivion while in his sleep because if you think about it, it's never been directly stated that the reason why Ventus isn't aging is because he has no heart inside of him within the Castle so in my eyes I think there is a possible "different" reason why Ventus hasn't been aging. Keep in mind that this involves spoilers for Union Cross so leave now if you don't want to be spoiled (although I guess that's pretty obvious lol). Ok so here goes: I do have 1 possible method as to why Ventus hasn't been aging which will not only solve the aging thing in Union Cross but a lot of others that have been speculated for years. Now this will get a little confusing so I'll just say it right here to get it out there: I believe that Ventus (specifically the one in Birth By Sleep) is actually a Replica/Puppet based off the Ventus we see present in Union Cross. A replica very similar towards the Riku replica and Xion. Now I know what your thinking "How the HELL would that make any sense?!?!" but please stop and think about it. Considering the replica's are exact copies of their original selves, that would most likely mean that they don't age at all as they are "Exact" copies. Now of course one flaw with this is that it's not been officially been confirmed if the replica's can age or not so that tiny detail could destroy this whole theory BUT I do have 1 more detail that link towards this being possible and another detail that can link to another mystery. They both come from BBS within Ventus's visit of Radiant Garden so try to remember. One of them is the moment where Evan/Vexan makes his appearance and has this exact quote: "Never mind him he's a special case" towards Dilan and then after both the guards leave "A heart completely devoid of darkness, very questionable." This implies that Evan must know something about Ventus, maybe that it was "his" creation because we all know Vexan was the one who made the replica program in CoM so whose to say he had that program set up even before those events? And finally the second detail is the next scene regarding Evan which is the one where Ventus saves Ienzo from a wave of Unversed. Here's the quote here: " I see we owe you our thanks, we have done our best to raise the boy since his poor *parents* are not here to do it." and afterwards "No thank you for keeping Ienzo out of harms way and well I can already see it that we are destined to cross paths again". Again implying Evan must know something about Ventus BUT that's not all that's interesting here. Remember the character "Blaine" that was introduced in Union Cross? It is my firm belief that Ienzo's so called "Father" is none other than Blaine. Now I'm not gonna say "that must mean Ienzo is a replica of Blaine too" because as you can clearly see Ienzo has aged throughout the games so that's false. BUT I do have a strong feeling that the two are still connected because I find the fact that Evan mentioned "Parents" to be a bit unnatural. Because come on, when did the character's parents ever get mentioned in this series? lol but seriously, because of the fact that they mentioned parents of a "not very significant" character does raise a question mark so with that in mind I feel like there's something more to him than meets the eye. (besides Zexion does have a his "Book of Retribution" which does look similar to the book of Prophecies). And honestly from this logic it points to the possibility that Evan could have been alive within the events of Union Cross just as Lauriam and Ventus was which leads to another thing worth mentioning. If Evan made a Replica of Ventus, then he must have had "known' who Ventus was for a long time and considering the line "I have a feeling we are destined to cross paths again" corresponds to the fact he "knows" he's gonna meet Ventus at some point which could also mean that he knew about the 5 dandelion leaders includiing Lauriam, Skuld, and Ephemer, (or at least the fact that he knew who they were, not that he met all of them). But here's my last mind blowing connection: What if Evan was acquainted with Blaine at some point? Maybe they were friends as Keyblade wielders in the Foreteller unions? But something happens during an event after the War which causes a terrible tragedy to happen to Blaine and at that point Evan swore to himself to protect and care for his "Son" and then eventually the "insert the reason why they are in the future here" happens and they live in radiant garden till the events of KH1 (as well as losing his keyblade in the process). But in BBS Evan was acting a little bit like a "father figure" towards Ienzo so maybe that was because of this (only a little though as it was only 1 moment so I do see that as a tiny flaw here). And not only that but Vexan seemed really pissed towards Marluxia at times within CoM which could lead to the possibility that Lauriam actually killed Blaine and not just Strelitzia? But one flaw I must point out here is that Vexan's attitude towards Zexion is quite contradictory towards what I'm suggesting so I will admit that and I also do realize how far-fetched this is so I'm %100 sure I will have even more flaws here so feel free to inform me of any more of those and a few uncertainties. (and sorry but I had to link the fact that Vexan could have been a keyblade wielder too ) But other than all the other info here the overall gist of this theory is that Vexan made a Puppet Replica of Ventus to remind himself of a boy he once knew (which would later be found by Xehanort or possibly "Given" to him) and took Ienzo (Blaine's son) under his care to give his respects towards Blaine. (again I realize how far-fetched and convoluted this is so please point out anything necessary). But with that I am almost completely SURE that there is a connection between Evan, Ventus, Blaine, and Ienzo so this theory is just the warmup!
I've been working on a theory regarding Ventus that could ultimately destroy the line of logic of why he's not aging in Castle Oblivion while in his sleep because if you think about it, it's never been directly stated that the reason why Ventus isn't aging is because he has no heart inside of him within the Castle so in my eyes I think there is a possible "different" reason why Ventus hasn't been aging. Keep in mind that this involves spoilers for Union Cross so leave now if you don't want to be spoiled (although I guess that's pretty obvious lol). Ok so here goes: I do have 1 possible method as to why Ventus hasn't been aging which will not only solve the aging thing in Union Cross but a lot of others that have been speculated for years. Now this will get a little confusing so I'll just say it right here to get it out there: I believe that Ventus (specifically the one in Birth By Sleep) is actually a Replica/Puppet based off the Ventus we see present in Union Cross. A replica very similar towards the Riku replica and Xion. Now I know what your thinking "How the HELL would that make any sense?!?!" but please stop and think about it. Considering the replica's are exact copies of their original selves, that would most likely mean that they don't age at all as they are "Exact" copies. Now of course one flaw with this is that it's not been officially been confirmed if the replica's can age or not so that tiny detail could destroy this whole theory BUT I do have 1 more detail that link towards this being possible and another detail that can link to another mystery. They both come from BBS within Ventus's visit of Radiant Garden so try to remember. One of them is the moment where Evan/Vexan makes his appearance and has this exact quote: "Never mind him he's a special case" towards Dilan and then after both the guards leave "A heart completely devoid of darkness, very questionable." This implies that Evan must know something about Ventus, maybe that it was "his" creation because we all know Vexan was the one who made the replica program in CoM so whose to say he had that program set up even before those events? And finally the second detail is the next scene regarding Evan which is the one where Ventus saves Ienzo from a wave of Unversed. Here's the quote here: " I see we owe you our thanks, we have done our best to raise the boy since his poor *parents* are not here to do it." and afterwards "No thank you for keeping Ienzo out of harms way and well I can already see it that we are destined to cross paths again". Again implying Evan must know something about Ventus BUT that's not all that's interesting here. Remember the character "Blaine" that was introduced in Union Cross? It is my firm belief that Ienzo's so called "Father" is none other than Blaine. Now I'm not gonna say "that must mean Ienzo is a replica of Blaine too" because as you can clearly see Ienzo has aged throughout the games so that's false. BUT I do have a strong feeling that the two are still connected because I find the fact that Evan mentioned "Parents" to be a bit unnatural. Because come on, when did the character's parents ever get mentioned in this series?
lol but seriously, because of the fact that they mentioned parents of a "not very significant" character does raise a question mark so with that in mind I feel like there's something more to him than meets the eye. (besides Zexion does have a his "Book of Retribution" which does look similar to the book of Prophecies). And honestly from this logic it points to the possibility that Evan could have been alive within the events of Union Cross just as Lauriam and Ventus was which leads to another thing worth mentioning. If Evan made a Replica of Ventus, then he must have had "known' who Ventus was for a long time and considering the line "I have a feeling we are destined to cross paths again" corresponds to the fact he "knows" he's gonna meet Ventus at some point which could also mean that he knew about the 5 dandelion leaders includiing Lauriam, Skuld, and Ephemer, (or at least the fact that he knew who they were, not that he met all of them). But here's my last mind blowing connection: What if Evan was acquainted with Blaine at some point? Maybe they were friends as Keyblade wielders in the Foreteller unions? But something happens during an event after the War which causes a terrible tragedy to happen to Blaine and at that point Evan swore to himself to protect and care for his "Son" and then eventually the "insert the reason why they are in the future here" happens and they live in radiant garden till the events of KH1 (as well as losing his keyblade in the process). But in BBS Evan was acting a little bit like a "father figure" towards Ienzo so maybe that was because of this (only a little though as it was only 1 moment so I do see that as a tiny flaw here). And not only that but Vexan seemed really pissed towards Marluxia at times within CoM which could lead to the possibility that Lauriam actually killed Blaine and not just Strelitzia? But one flaw I must point out here is that Vexan's attitude towards Zexion is quite contradictory towards what I'm suggesting so I will admit that and I also do realize how far-fetched this is so I'm %100 sure I will have even more flaws here so feel free to inform me of any more of those and a few uncertainties. (and sorry but I had to link the fact that Vexan could have been a keyblade wielder too 
) But other than all the other info here the overall gist of this theory is that Vexan made a Puppet Replica of Ventus to remind himself of a boy he once knew (which would later be found by Xehanort or possibly "Given" to him) and took Ienzo (Blaine's son) under his care to give his respects towards Blaine. (again I realize how far-fetched and convoluted this is so please point out anything necessary). But with that I am almost completely SURE that there is a connection between Evan, Ventus, Blaine, and Ienzo so this theory is just the warmup!
Edited by Finn and vigor