We recommend physical (mineral) blockers—look for zinc oxide and titanium dioxide on the label. These work well for all ages and skin types, including sensitive skin. You don't need to spend a lot of money on sunscreen; an inexpensive one is perfectly fine, especially since you should be reapplying every two hours when you're outdoors. If you're shopping for a facial sunscreen, make sure the label specifically says "facial"—these tend to be formulated to be less likely to clog pores or irritate the eyes.

That said, the best sun protection isn't a product at all—it's a hat, sun-protective clothing, and an umbrella. Sunscreen is a backup, not your first line of defense.

If you have dry skin, look for something thick and occlusive. Plain petroleum jelly (yes, Vaseline) works great if you don't mind the stickiness. The real trick isn't the product, though—it's the technique: apply it right after you get out of the shower or bath, while your skin is still damp (don't towel dry first), and then put on snug-fitting clothing or pajamas to seal that moisture against your skin.

The ingredient with the most evidence behind it is a retinoid. Tretinoin (available by prescription) is the gold standard—it has decades of research supporting its ability to improve fine lines, texture, and pigmentation. If you're not ready for a prescription, over-the-counter retinol is a reasonable starting point; it works by the same mechanism, just more slowly and with less irritation. Start low and slow and use it at night. The key is consistent use over years, not months. It's also important to have realistic expectations—retinoids work best at maintaining and preserving where your skin is now. They are not going to erase deep lines or lift sagging skin, but used faithfully over time, they are one of the best tools we have for slowing the clock.