Wow. Adding to what was said before me, there are so many factors in looking your age but there are studies that show the impact of long-time exposure to sun. Take for example these pics 1& 2. So yeah, If you are all day in the sun, putting sunscreen will protect your skin, but then you may look very young without it or very old despite it.
Sun screen can't fix genetics, stress free lifestyle, healthy habits and everything that was already mentioned here. It is very individual. I would still recommend using sunscreen, just to prevent it from getting worse. A lot of AB philosophy is based on prevention from happening and i couldn't agree more. You could tackle sun damage after the fact, but avoiding it sounds so much better to me...
I have very sensitive skin and am also relatively pale, and as a child I used to get burnt even during the winter. Because of this my parents put sunscreen on me since I was 4 years old. Can't begin to describe how annoying it was to smell like sunscreen all year long as a child. Moving on. I'm okay. Anyway, now I'm soon to be 24, and I can't say it makes me look younger or older, but it definitely protected me from long-time sun damage (wrinkles and spots, sagging and etc, but these can happen from other reasons too). How old I look I find to be closely related to how I dress and style my hair. Sometimes people say I look barely 20, sometimes the say I look 27...
Sorry for the long post <3
