Limit time in the sun. Try to stay out of the sun between 10 a.m. and 4 p.m.

Limit time in the sun. Try to stay out of the sun between 10 a.m. and 4 p.m. 

This is when the sun's rays are strongest. Don't be fooled by cloudy skies. The sun's rays can go through clouds. You can also get sunburned if you are in water, so be careful when you are in a pool, lake, or the ocean.

http://www.nia.nih.gov/health/publication/skin-care-and-aging