“The saddest thing about getting very old is that you outlive all your friends.” That was said to me many years ago by Evelyn, the 95-year-old mother of my closest friend. Her advice was, “Start making friends with people 20 years younger than you are once you hit your 70s.” 
Evelyn was quite a dame. She outlived two husbands and an endless string of boyfriends. When I was visiting her at her condo in Florida in assisted living that time, I asked her if she had a current boyfriend. She answered, “I have the only one here but he isn’t much.”