I've, personally, seen PopSockets on mostly adults' phones than teenagers. When I used to live in NYC and rode the train, mostly adults. When I used to travel to hospitals around the country for work, again, mostly adults. On the plane, mostly adults.
Anyway, I've always been a fan, myself. I've had them on almost all my devices for several years now. I have it on some of my iPhones, iPad Mini, iPad Pro (till I had to stick on a semiconductor refrigeration cooler) and Z Fold2. It's just simple convenience - keeping the phone from falling on my face at night, or just in general especially for large screens. Sticking it on the vent mount for navigation, etc.
I was lucky to snatch up the PopWallet+ for MagSafe before they sold out. I wanted a MagSafe wallet anyway but was torn not having a PopTop. After having used the original PopWallet+ before, I miss the convenience of not having to carry around a wallet in my pocket.
Hopefully, the magnets are strong enough. I have this (N35) magnetic plate with a PopSocket stuck to it that I can quickly switch between my 12 Pro Max and 12 Mini (both with cases with MagSafe built into them). However, my 12 Pro Max with the LiteChaser Pro case will just fall off it. That's okay since I usually handle that phone with the camera grip. But my 12 Mini stays on it strong with either my Mous Infinity case or my Casetify case. So I'm assuming the PopWallet+ will stay on just fine on the 12 Mini if it's got the same grade magnets. That's the phone I want to use it on anyway. I think it'll be sized perfectly for it.