I'm not sure I understand, but if you're asking what how old they get in a real life year its:
a real life year is 365 days and each wolf play year is 12 real life days. That's 30 wolf play year. I dont think a wolf on this game can get to 30 years old, I think 24 is the oldest.
If you're asking when they age, it's ever wolf play spring 1