Is sunscreen the best anti-aging product you can use?

Yes, as long as you use it right. Sunscreen blocks UV radiation that causes both sunburn and cumulative skin aging like wrinkles and spots. You need broad spectrum SPF 30+, apply enough (most people use half what they should), and reapply regularly — SPF 100 doesn’t help if it wore off hours ago. Mineral sunscreens are more stable and less irritating, but any sunscreen is better than tanning. The real anti-aging hack is not skipping it on cloudy days or when driving, since glass doesn’t block UVA.