I might have run against you. I'm 60 and used to live on Long Island (left about 12 years ago).
I have very rarely run with anyone in the last 10 years ago. I enjoyed being part of a big training group at a club in England years (made things like 20x400m much easier!), but also like being able to arrange my day to just train when I feel like it, rather than being committed to a certain time.
I stay motivated by racing, and trying to slow the decline as much as possible. I don't have any problem getting myself out to train - I actually feel bad when I have (a planned) day off.