Posted something about this a few months ago, but it's time for a refresher: Like a lot of California guys my age, I had the darkest tan on the beach for 40 years. Even into my 50s, and long after the wisdom of sunscreen was well known, I often didn't wear it, for all the usual reasons--too much trouble, tans look good, I'm protected because i have a good "base tan" (myth), etc.
For about the last two years, I've been trekking down to the dermatologist to have one kind of lesion or another frozen or cut off my face/arms/legs/ears. Mainly lightweight, non-deadly stuff so far, classed as "pre-cancerous," but with scary potential. Got another biopsy scheduled in a couple of weeks.
Wear the sunscreen.