Our field hasn't been around long enough to generate all that many 65 year old programmers. But they're out there.
I'll tell you something, you young whippersnapper. There are lots of 45, 55, and yes even 65 year olds out there who can kick your youthful athletic brain's ass, any day of the week, every day of the week.
People like, say, Martin Odersky (54). Simon Peyton Jones (55). Xavier Leroy (45).
I'd also add that a lot (most?) of the programmers outside of academia that started 20-30-40 years ago have been promoted out of coding jobs - the culture's changing, slowly, but previously the decent salaries were reserved for management, not programmers, and assuming you want to earn more...
I'll tell you something, you young whippersnapper. There are lots of 45, 55, and yes even 65 year olds out there who can kick your youthful athletic brain's ass, any day of the week, every day of the week.
People like, say, Martin Odersky (54). Simon Peyton Jones (55). Xavier Leroy (45).
Don't worry. Keep learning. Stay interested.
Set for life isn't necessarily permanent.