To be totally honest, I think the speed of my thinking has slowed with age. But what HAS changed for the better is this:
- more experiences to draw upon that help in problem solving
- the willingness to think "out of the box" and not according to rigid doctrine I'd been taught in school or at home
So it's sorta like my "processor" isn't the fastest, but my software is improved, with a larger database. If I have the time to mull a problem over, my chances of solving it are pretty competitive with any youngster out there.
The wild card here is specific technical skills. But when discussing simple logic and less specialized areas, I'll run circles around most kids. And those who run circles around me, well, bless 'em, the human race still has a glimmer of hope.