When I started earning my own income I went to a grocery store and walked up and down the cereal aisle, marveling at how, if I wanted to, I could buy one box of every sweet cereal on display.
I can no longer eat any cereal. At my age it no longer agrees with me, gastrointestinally. I miss it. Sometimes I'll say "f*#k it" and buy a box. Like a bottle of alcohol, it's wonderful going down, but the next day is filled with regret.