I'm not sure where you got that impression. At 51 I'm still making new friends, mostly by seeking people out who share hobbies that I'm interested in. It gives me a base level of conversation to start out with. I recently started up a great relationship with the curator at a clock museum simply by going to his museum and talking clock with him. I go visit him at least once a month now, and he's begun to introduce me to other museum curators in the area. I also made a new set of friends recently by answering a Craigslist ad for a classic car in the area, then going to look at the car and talking to the guy for a couple hours. He invited me to a Sunday drive with a group of local classic car folks, and now I'm part of the group.