Decent trainers are really comfy. I let my grands friend who was in her 70s try my Nike Airs on when I was a teenager and she was overjoyed at how comfy they were. She said she was going to go buy herself a pair.
Why shouldn't we have comfy feet as we get older? Tell the 19 year old you who thinks they're the only for the cool kids to bog off.
It's a pair of shoes, your feet deserve comfort!