Okei i know the aging for a cat or a dog, and other normal animals its easy to find out, but say for a hoppogriff? I gonna buy and train a young hippogriff but its hard to plan anything when no idea how fast it ages :)
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Lions can live for about 14 years.
Horses up to 30.
Eagles have lived up to 40 years altogether.
Add it all together and divide by three.
Hippogriffs live about 27 years. I'd be inclined to add another ten years on that due to their magical nature.
Better yet, see if there was an 'Ecology of the (Hippogriff) in an old Dragon. That might tell you.
Good reasoning, thanks :)