Frail or Small
Bodies that don’t have much natural insulation can naturally get cold quicker. Muscle mass is less, so the body generates less heat. Blood spends more time near the skin, so it cools off sooner. People with all types of bodies can probably enjoy the snowy breezes, but may need more precautions.
Frail People (Usually Older)
Frail older people are at risk. Being old doesn’t matter. But frailty may mean you’re less able to generate heat, and that would mean slower blood circulation so the blood cools off sooner. You may have less body insulation, greater risk of disease that may combine badly with hypothermia, and, not as often as some younger people may think but sometimes, impaired judgment.
A frail person of any age can go out in the cold, of course. It’s just that more clothing and other precautions are likely needed. Go out and enjoy.
Little People (Usually Children) and Thin Adults
Toddlers, babies, and small children and possibly adults of short stature and people who are thin enough to show ribs, like from anorexia or bulimia, may be more sensitive to the cold. Yet, children happily play in the snow. If they get red cheeks, that may be as far as hypothermia gets. And they don’t exercise much, at least not in a formal sense.
They exert themselves a lot, though, when they play, run, bounce, throw, make snow animals, slide, and laugh.
If they stand still, like at a parade, they get cold like the rest of us. Or colder.
Exertion makes up for size.