I think you'd perform a public service if you wrote to those
theatres and told them that "they" would find 60+ actors very
easily if they'd take the trouble to look. If they don't have
a list of them, it's because it's been so long since they did
a play with an older role that older actors have stopped wasting
money sending them headshots/resumes.
The suburbs are filled with people who trained for theatre
but "couldn't afford" to act when they had heavy work and family
responsibilities, who are eager to act again now that they are
on Social Security. Every time I go to audition for an "Old
Broad" role, there are dozens of excellent actresses, Equity
or Non, competing with me for it. It's a struggle to get a callback!
You can quote me on this.