Impossible to say until you're actually old. If you're under 60 you still have tons of people in your age group to talk to every day. Once you hit 80 and 90, that will probably change.
My father interacted with a lot of people, until he was about 70; then the number fell off pretty quickly, and he started going to a lot of funerals. When he died, aged 103, noone at his funeral was an old friend, they were all descendants or friends and relatives of descendants. All the old friends had died off.
Men die younger than women, on the whole; so I guess lonely old people are predominantly women.
Men die younger than women, on the whole; so I guess lonely old people are predominantly women.