Chronic sun exposure affects the skin differently than intermittent:https://www.researchgate.net/figure/Differential-dependence-of-melanoma-subgroups-on-sun-exp

Chronic sun exposure affects the skin differently than intermittent:https://www.researchgate.net/figure/Differential-dependence-of-melanoma-subgroups-on-sun-exposure-and-types-of-gene_fig1_331818745 https://www.researchgate.net/figure/Differential-dependence-... If you stay indoors 95% of your time, then yes, by all means, use as much sunscreen as you can. If you spend most of your time outside your whole life, your skin is already conditioned to deal with UV damage. Otherwise we would have gone extinct due to skin cancer, aren't we?