Women tend to show signs of aging on their hands first. Brown sun spots and tiny wrinkles are a dead giveaway that you may have spent too many days in the sun neglecting your hands. Living and working in Southern California I have seen this too often. I see women with beautiful faces and skin but their hands look like they are approaching 50.
It is never to late to start protecting your hands. My suggestion is to never leave the house without wearing at least an SPF 15 moisturizer or sunscreen on your hands, even in the winter.
Simple but so important!