I'm 29, I do not believe I have low test, however I was just curious.

I have no problems with my libido at all, I'm a horny bastard for the most part.

However I am not very hairy - little to no chest hair, arms/legs are normal nothing crazy.

Facial hair is normal..

I was just curious if there are any tell tale signs I should look for as I get a little older.
Thanks guys!