Is 20 too old to try bjj?

WOW!!..... my grandpa started doing BJJ at 45 and now has a black belt and will submit anybody in my opinion. The crazy thing about BJJ is once you learn, you then start doing your own crazy moves with it and turn into a freak. You could be the next Damian Maia " BJJ CHAMP " but most people just wait and wait and wait and never do it.