Pets should be able to grow in size!

[Gotterdammerung]

To find out how old your wyvern is you would need to mark the exact play time u hatched it and subtract that amount from ur current total playtime. The number of hours you have played since the hatching = the number of days old ur wyvern is. Every real day of playtime = 24 Vana days roughly. So roughly every 15 days would be 1 vana year. And every year in real life is around 24 vana years.

If u played 7 years your wyvern is roughly 168 years old. you would need to play another 35 years irl to break 1k year old wyvern

But if we did implement aging into the game all the humes would fall over dead from old age.