I have asked many of my gay friends, including straight friends, to set me up.
I met my last boyfriend through one of the married, straight gals, at my office I have plenty of gays in my social circle, after all, I am gay.
Most of the men I meet in my age group, are somewhat bitter. There's nothing wrong with these activities, but I notice older men don't usually suggest activities such as hiking, running, bicycling around town.
I find that dating at this age has become a real turn off.
Not a joiner myself but you might be able to find hiking clubs, kayaking clubs, skiing clubs or maybe masters swim teams or cycling teams.
You'll probably find gay men there even if the organization isn't specifically gay oriented.
OP I would try a bicyclist's club and or a running club.
R24, just to answer some of your questions, other than just answering your question about the picture, let me say this: Yes.
Like R7 sez, you have plenty of years to meet up with the right active guys. I found my LTR active boy toy 20 years ago preaching at MCC church. I am not interested in a hot twink, even though I still admire them. Had I known it would become this difficult, I would have made a greater effort as a younger man, to find a LTR partner. Go out, have fun, but never forget that unless you die in a grease fire anytime soon, you too, will be 50. I am friends with a gay married couple (they're 40 and 60 years old). They also go to San Francisco once a year and meet with friends there. To me, if they are not there, working out, it weeds out the men I do not want, while presenting the men I may want. But I've been to a number of gyms in Manhattan (because of Sandy, there was some gym hopping) and most of the guys are 30 and up but mostly over 35.
Since you said you're set financially, you can afford to travel to some of the more higher-end gay-filled areas. R24, I may post a pic, but that's not really my style, unless I'm posting on a site specifically geared toward dating, not hook ups. I'm about to embark on a hiking trip, solo, up Runyon Canyon. Of course, there are exceptions but you really see it in the summer.
The 20 somethings you see in the Hamptons, Fire Island and the parks and piers are not concerned with working out and many look doughy. I'm there to workout, not S&M (stand and model for some of you).