I think there’s a difference in average maturity between US teenagers and European teenagers. I moved to the states when I was 20 and was shocked about how childish some of my new peers seemed. And I remember also being completely surprised I couldn’t even lift my dad’s case of beer into his trunk (he’s a wheelchair user). The cashier flipped out when I picked it up.
Pratchett talks about this in “Moving Pictures”. He has many insights, 100% would recommend. GNU sir Terry