The standard being 20kgs under weight, skin baked like old leather, and a previously broken collar bone.
But, nothing beats it.
Wear sunscreen? It's necessary to not age fast if you go outside often. And moisturizer and retinol if you'd like too.
I wish it were that simple. I’m of Scottish and English genes.
I wear spf 50 and still get burnt in the savage New Zealand sun.
I try to go early.
So this is why 30/40 yo track athletes look older than their age mates? Right.
Nonsense. Running at an Olympic level and pushing the boundaries of what we've evolved for might leave its mark. But that is not what is being talked about here.