I'm a 57-year-old engineer still going strong, and I know plenty of others. This job isn't conceptually that hard if you have the experience to break problems into manageable chunks. I probably can't juggle as many things in my head as when I was 25 and proudly cranking out spaghetti code. But experience makes up for a lot of that.

Now, would I relish looking for a programmer job right now at my age? Hell no.