But think about this. Our ancestors in Africa walked around in the sun with out clothes on all day long and never got burned. Certainly not the case with us, but they were set up to thrive in that environment which was constant and year around. Their vitamin D level was optimized and they never got burned. That is exactly what I am saying here. Optimize and never get burned, realizing because of migration of people out of Africa and wearing of clothes it is very easy to get burned in the summer and set your self up for problems down the road with skin cancer. It is the burning in early life, especially, that sets you up for skin cancer. Also realize that vitamin D is protective against cancer and that burn probably occurred when your vitamin d level was likely to be low.
Also, and I have heard this over and over, it is harder to get burned in the sun if you vitamin d level is optimized, even for a red head.