Good for you Smet. I just made 20 years of BJJ last October and while you do need to modify your approach to accommodate the aging process, there's no reason not to do it if you enjoy it. The real secret to success in jiu-jitsu is to cultivate a good relationship with your training partners; they will actively look out for you that way. Avoid hardheads until you have a better grasp of your own level, and just be willing to tap any time your body is in a compromised position. It's only training.
"Abashed the devil stood and felt how awful goodness is." -John Milton, Paradise Lost