Age spots. These "liver" or "age" spots, o/w called senile or solar lentigines, are very common over 40. Of course with pigmented lesions it is very important to consider more serious, and possibly life-threatening forms such as malignant melanoma. So, always see your dermatologist if a lesion is changing or has any of the warning signs of melanoma- http://www. Ncbi. Nlm. Nih. Gov/pubmedhealth/pmh0001853/.
Probably. Previously sun exposed persons at more risk.