I have also noticed some trends - emphasis on the word "I".
It seems that children are medicated sooner - asthma, ADD, etc.. then the teenagers and their allergies and acne... the twenties are, I guess, pretty painless? Mostly birth control type meds? Thirties, probably at least one chronic ailment - reflux? (too much coffee, too much stress), IBS? This continues into the forties... The fifties and sixties - not uncommon to discuss Viagra and HRT (hormone replacement therapy)...
Believe it or not, I am looking at this without negativity I am just kind of putting a mental map into words (not very good words, but words nonetheless)...
Any thoughts?