As one gets older, melanin tends to clump, resulting in freckles, blotches and spots, instead of rising evenly to the skin's surface the way it did when we were younger. This is particularly prevalent in Caucasians, even if they tan well. I know, because I'm one, and I have the sun damage from earlier years to show for it. Back in the 1950s and 60s, there weren't any sunblocks and nobody really knew much about sun and skin either. I'd say, if one were a lighter-skinned Caucasian that tans easily and well, that would be a warning about a tendency to hyperpigment(aka sunspots, freckles, etc.) later in life, and stay out of the sun instead.