You are most definitely not alone. Having moved to another state last month, I'm in the same boat right now. My biggest gripe is that when a potential riding partner sees my white hair, they assume that I can't hack it. Age discrimination really infuriates me!
My attempt to find someone to ride with: I'm going to hit some of the umpteen bike shops in town and ask if there are some riding groups that have any "mature" riders. (double entendre intended)
Old age is not a disease-it is strength and survivorship, triumph over all kinds of vicissitudes and disappointments, trials and illnesses.
Maggie Kuhn