So true. I volunteer in an organisation with many older members, and a few of the older members have a thinly-veiled disdain for the younger people who don't contribute the same time and effort that they do... so some young people just stop turning up because they don't want some retiree with no life judging them for having a job, family commitments etc.
Could the market itself be encouraging demographic segregation. If we measure and focus on economic growth above all else then the workplace becomes the place more important than all others.
There are still social activities connecting people of different age groups although I agree with the above comment that structurally the society we have has been eroding non-labour market interactions.
In the past a lot of activities connecting different age groups was a job or job-like too. Working on a farm or a family business together. Running a household and childcare together.
There's only so much meaning one can feel in a life.
This sounds like an inversion of cause and effect.
> All three activities are hobbies. [...] It's nothing that gives life a purpose.
I find this to be a dire outlook, myself.