26°C for me. I live with my son & he enjoys wearing as little as possible at home. Cold also makes him feel depressed. I’m alright with both hot and cold.
18°, I sometimes push it to 19 if I’m feeling flush.
My parents are in their 80s and rarely go over 15° on their thermostat (unless I’m there complaining!)
My dad’s parents only had one heated room in the house, but that one room was heated like an oven to a really uncomfortable temperature 😆
I’m like your grandparents today. Grew up in DDR, had one heated room: the kitchen. It was also our living room, and on the coldest nights our bedroom. Not heated like an oven though.
It makes me physically uncomfortable to be in a >18C room in the winter, even today. I know it’s just a psychological thing, probably.
Exact opposite from my grandparents. They keep it at least 27 in the winter. It makes it very unappealing to visit, and I have to take frequent breaks outside in the snow.
I assumed that was all old people, since my spouse’s grandparents are the same. Now I’m hoping they’re the exception and most older people aren’t living like lizards in terrariums.