What influences evolution?

[utopianmachine]

[SIZE=8pt]For example, one Tama I had became an adult at age 3, while I have one currently at age 3 that hasn't evolved. [/SIZE]

 

Another Tama turned into the old character at age 10, while my friend's is at age 10 and did not turn into the old character.

 

Any ideas?

 

[tamafruits]

Really? I wonder how your tama became an adult at 3 yrs!! It's supposed to at 4 yrs

 

[Spring]

uh, the ageing system for v1s and v2s are different. that might have something to do with it.