How do you tell the age of a garter? Is there a surefire way, or do you just have to guess? I have a male (I'm guessing) red sided garter, but I caught him myself so there's no way to tell his age that I know of. And how soon does a garter (male) supposedly stop growing? I know they never stop, but how long until they are "fully grown"? He's 20inchs right now.
If it helps I can get pictures.
It's not that important to me, but it would be nice to know.