"I'm no fool; I realize there are teenagers that can blow me away in the 3D area skillwise"

Does not mean you can't do a BLOW BACK ;-)

YOu are not playing football. As long as your mind is working and you are not 80+. It's too early and NEVER LATE!!!!
NOw get some Nitrogen into you and stick your head up high :-)

I was reading somewhere last month about a guy who is 76 and doing some good video editing work. He started at the age of 72.
SO as long as your marbles are intact you can do anything.