I've always been very strict about using sun protection on holiday or when out in the sunshine. I am very fair skinned, and a high SPF is a necessity the moment temperatures rise to avoid sunburn (or worse, skin cancer). But I never truly believed I really needed SPF on my face in the middle of Winter. How wrong I was.
Nothing ages your skin faster than sun exposure, and that doesn't just mean blazing sunshine on a tropical beach. Daily exposure to UVA rays (even through clouds, reflected off snow, or partially passing through glass windows) makes you look old. Listen to Baz Luhrmann, guys. Use a sunscreen daily (the French make the best ones). You'll thank me when you're 50.