I'm in my mid 30's, and my father noticed this weekend for the first time that I've inherited his freckles. Before I changed my diet I was never able to tolerate enough sun to bring them out.
Yesterday I spent 5 hours at an outdoor event, and only my left arm that had gotten extra sun on the hour drive over felt overexposed. I took my hat off and started shading that arm with it, and I'm just a little pink there today, with no pain, so it should heal up quickly. I'm wore long sleeves when I doing yard work after the event just in case.
Speaking of my outdoor event, I spent most of that five hours walking around the event, and I think I did pretty well. I'm a bit sore today, but nothing extreme. I still did yard work and helped move some boxes after the event.