Earlier quoted context omitted.
Most people have no idea I'm 41, and instead think I'm in my 30s. Balding and grey hair show I'm not in my 20s ;) My 'secret' is I workout every single day . I might do heavy weight training, sled pushing, surfing, or a spin class. It doesn't matter as long as I do something physically challenging. I also follow an 80/20 rule on eating paleo-ish. Mainly I try to avoid processed foods, but I'll still eat a pizza or go…
Counterpoint: my wife and I are well into our 40s yet often mistaken for being much younger. Being significantly overweight gives us nice smooth wrinkle free skin.
In spite of being prematurely grey, I have a "button nose" and cute ears for a 53 year old.
There's lots of details that influence perception of age.