KHUX A Question About Time Gaps

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So, we've been to different Disney worlds.  We've seen that all of them seem to be in different time periods:

1) Beauty and the Beast in 17th Century France.

2) Aladdin set possibly in 632 CE though I've seen some video where there was a stop sign from an Aladdin game and Genie's jokes regarding 1990s pop culture.  He also said that he was in the lamp for 10,000 years and in the series we got to meet his former master that traded him away to a sorcerer for eternal life named Ajed Al-Gebraic.  But, let's just go with 632 Agrabah, which could be a fictional city in modern day Iraq.

3) Cinderella set in late 17th century France.

And, you get the gist of it.

My question is this.  How does time lines work in the KH Universe.  Can one year on Destiny Islands equal to twelve years in Atlantica?  Can a year between KH2 and KH3 affect the Pride Lands?  When we last visited the Pride Lands, Simba joked about Timon and Puumba babysitting his cub.  Was that cub Kiara?  Lions typically start breeding around three or four years of age.  So, we might get to see Kiara and Kovu as cubs at one point but then return and they are in their teens.

I also have to question about how Riku, Kairi and Sora were able to do a lot of growing in the span of one year.  They were fourteen and fifteen in KH1 but looked like they were in their preteens.  How then can a year or in the case of Days (less than a year) cause all of them to grow up so quickly?  Maybe, it could be explained away by Sora and Riku visiting and temporarily staying in other worlds but Kairi and Selphie who have stayed on the same world for a year or several months have grown up?

Also, we saw in the trailer that Eraqus and YX were playing chess but years later during the events of KHBBS, MX looks extremely older than Eraqus.  Could MX's age be tied to using darkness to travel to different worlds or something?  And what about Ventus?  How come he remains sixteen even while asleep from his heart leaving him remains young while Aurora has aged between the events of KHBBS and KH1?

How come Ventus remains basically the same as he was in BBS in KH3?  Shouldn't he technically be older?  Does your heart missing from your body stop your body from aging?  Also, how come Namine ages between the events of KH Re:Com and KH2 but Roxas's doesn't?  I did remember seeing some cover art somewhere about an older Roxas leaving the Organization, he was much older looking. 

Can traveling between worlds and the means of doing so, have an effect on your physical appearance like your age?