My mom, bless her soul, thought I'd like elastic waist jeans so found me a couple of pair at a rummage sale to try. I liked them. That was when I was 50-ish. At round 55, I learned about cotton leggings (allergic to poly), and I haven't taken them off since.I'm getting to the point where I don't care what people think. Elastic waist jeans fine by me!
I'm 65. I sleep in them, wear them around the house, and even have a few fancier pairs for going out.