How old do toi think are beloved hedgehog is, Sonic the hedgehog?!?!!Cause..what the hell do toi think?(Lol)

Some say In the originL sonic series ou just the sonic series he is normally 15, some say in video game series, he is 21, some say in all any ou both sonic series he is 21 ou 15.
So SON!!
Like I a dit in the question , what the hell do toi think?(Lol)