I agree fullcactus1234 , also in my 60's I've seen the same pattern in life.
People will come in and go out of your life as you get older. If you have 1 good friend your very fortunate. I've been where you are and have to say it is scary.
I wish you the best. I would though be grateful for even some acquaintances!
Sometimes I'm happy to just get a smile out of somebody. I've found that even though we humans are really social creatures I prefer to be alone , only if I got my head straight ! ( Which isn't often !)