I’m older than you, Doc, and a woman to boot. As I said above, I find that I am myself the worse practitioner of ageism — on myself. I’ve been taught by this culture to doubt myself in ways I should not. You and I are fortunate, however, because we can be independent, and we can also write. The argument I have always been able to bring to the table to defend my value is my writing ability, much more rare in young people.
Oh, and I can do math in my head. Everyone my age can.