The living among the dead

I've got my masters in social work several years ago. I know that people in my parents generation are going to create a large strain on the economy and also personal finances the older they get. But lately, I've been thinking about what it's like when all your friends have died and you are retired. Who becomes your friends? Especially if you have health or mobility issues. How can you make new friends if confined to your home.

Now, I'm no where near old, but even now I find it hard to make friends outside the workplace. We are all so busy with family, work, school, parents, other activities that it is hard to find new and interesting people to become friends.

I do not have any grandparents anymore. They have all passed away. But my last grandparent lived a very long life and when she died, her husband had been gone for 17 years. She never grandma never remarried, never dated anyone else. Her friends died previously and really, at the end, she would talk about her friends and how they had all died; she was the last one left. She was so ready to die. She wanted to see her savior and she didn't want to hurt anymore. She didn't have friends. She had family in end. But what if you don't have family and your friends are dead? How do you survive then?