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

Some say In the originL sonic series of just the sonic series he is normally 15, some say in video game series, he is 21, some say in all any of both sonic series he is 21 of 15.
So SON!!
Like I zei in the vraag , what the hell do u think?(Lol)