When at the pub with “the boys” (average age 75), it is a regular topic of conversation in the “today’s generation” don’t maintain anything, be it bicycles, lawnmowers, washing machines, etc
It is always difficult to draw conclusions from your own experiences, since the may not be typical, but, for me, born 1947, I didn't have a “bought bicycle” until I was 11. I had two cousins, a couple of years older than me. We used my uncle’s garden shed as a workshop, and, scrounged bicycle bits from anywhere we could, including the “rag and bone man”, to build ourselves a bicycle each. I recall, my dad showing me how to find and fix a puncture in an inner tube. He showed me once, then, said “ok, you can do that yourself from now on”. All this, as I say, before age 11.
None of that for my children, we were affluent enough to buy them bicycles etc. I do recall once showing them how to make a “bogie” out of old pram wheels and a plank of wood. They loved it, and, were the envy of other kids in the street. Their mother (Mrs B mark 1) was horrified, “what will the neighbours think”.
My children are now in their 50s, no “mechanical skills”, my grandchildren are even less skilled, and, have everything brand new.
In the street where I now live, there 5 children under 11, bicycles are not even put away at night, but, just left lying where they dropped them.