In our hot weather, we can easily get sun-burned going out into the sun unprotected. The sun is damaging to our skin and without any sunscreen or sunblock, our skin will break out into sun spots which will discolor even more and turn them into what we often call age spots by mistake.
Contrary to what we think we know, age spots are not just related to age. There are young people who also get age spots due to being over-exposed to the sun unprotected. So, if you do not want to look years older than your age, do take steps to protect your skin. It pays in the long run.