[Question] Places to meet interesting middle-aged men?

The rationalist community is a nice place to meet interesting, intellectual men, which makes it potentially a good dating pool for straight/​bisexual women. However, this community is young: most people seem to be in their 20s or 30s. For middle-aged women like me, that’s a problem. What are some other communities where it’s easy to meet straight/​bisexual men who are: (i) intellectually interesting is vaguely similar ways to how the rationalist community is intellectually interesting (ii) middle-aged and (iii) available?