Really interesting to read all of these!
I recall thinking very clearly that 24 was a GREAT age to be. I was starting to 'feel like an adult' while still having all the energy, resilience and looks of youth. Finished uni that year and was living in a cheap shared house with damp, mould, slugs on the bathroom wall (!), another couple and the boyfriend I would ill-advisedly marry. We made it our home and felt happy there despite the housing standard.
After one false start with full-time work, I had a brilliant job that led seamlessly to my career move on turning 25. Our social life was incredibly active, both personally and through work, and we travelled a lot by bus and train - the bus to Greece was an experience not to be missed nor repeated 😂
We did everything on the cheap because we were saving for our first deposit; bought our first London flat the following year. (It was a battle to get my salary included for the mortgage, we had to squat for six months, and our interest rate was 19.5%)
I do feel today's young adults often expect too much in terms of comfort and facilities: their expectations mostly seem to be of a sudden transition from student to home-owner with a car, their parents filling in the gaps. They get cross when the mortgage and car, etc, fail to magically appear for them. They're missing out on the fun and excitement of being young, adaptable, innovative, experimental.
I think your DS is thinking along the right lines, and wish him lots of adventures!