My aunt and uncle are childless, i their mid sixties now.
They’ve always been interested in my and my brother, had us overnights and come on holidays with us sometimes. I’m very close to them now.
My aunt spent her 40/50s working in a glam job, jetting all over the world. She’s amazing at keeping up with people and has just so many friends. She’s constantly seeing someone. She likes fashion/beauty and her garden and home are beautiful. She loves eating out. They are now retired to the coast and do walking, holidays, seeing friends. She has a caring role for her MIL, but not too much. She sometimes looks after my kids, but not too often! She loves baking/theatre/coming to London for lunch in a hotel.
My uncle potters about, he’s very sporty and loves sea swimming/golf/cycling/gardening.
Two things I’ve noticed about them - they say yes to pretty much anything. They will show up, make the effort, and so they’ve built and maintained really solid family and friend relationships.
Another thing is they love the small things. My aunt will be as thrilled by a nice walk and a coffee on the cliff top as she is on a five star holiday. I think if you need a big narrative to your life you might struggle to get that without children unless your life is especially notable on some other way.