I've lost a few friends over recent years, for various reasons (drifting apart rather than falling out.)
It's made me analyse why and one thing that comes up is the age difference.
My close friends and I are 3-7 years apart (older and younger.)
The friends that fell by the wayside were 10 - 15 years younger.
I guess I felt we didn't have much in common other than how we met (often work-related.)
My DCs are adults in their early 30s. I'm young at heart but find friends who either don't have kids at all, or their kids are just about to start uni etc are on a different page.
On the other hand I have friends in their 90s. So that works, but friends who are a lot younger, it doesn't seem to.
Anyone else?