This.

Many retired people need help with what others consider everyday (monthly, yearly) tasks: changing filters, fixing a door, light bulbs, or minor electrical fixture/switch/appliance repair, stopping ants entering the building, a leak in the ceiling, etc. Fixing PC problems counts too.

Anyone who has owned and maintained a home is capable of doing these things provided they're in good health. I'm always happy to help my retired neighbors with their little problems, perhaps b/c I don't have enough of them and they are an interesting distraction, as well as making me feel helpful.

And helping people from abroad, new in the country, learn the language.

There're lots of older / retired? people at a library here where I live, two evenings a week, meeting younger people (say 15 to 35 years old) who recently moved to here, with learning the local language and school work.

There're younger volunteers too, helping out with the language, maths, chemistry etc — but I was surprised to see that many older & retired people, maybe 70% of the volunteers. (This was before the virus, now I think libs are closed.)

My aunt went to a great retirement community outside Boston. In her 80's she was Chair of the Computer club, and helped lots of newcomers find their feet. She also edited the newsletter etc. She wasn't alone in that community in being active. She lasted til 94 and was pretty healthy til last few months - and had no regrets and didn't particularly want to live on. Great example...