Another lemming posted some data already but I guess, intuitively, it makes sense: no responsibilities and usually taken care of -> some responsibilities without the PFC/maturity necessary to handle them efficiently but you still somewhat prioritise and have time for fun-> even larger responsibilities (usually caring for other people as well, like children and parents) but with enough maturity to handle them without needing to focus on youthful hedonism -> fewer responsibilities but still mature and now probably in a better financial position, and you can already be satisfied with your lot in life and what you’ve done with it -> little to no responsibilities and you’re usually taken care of.