I'd imagine there are a good few, but that for a lot of them their websites expired when the owner did. For example my Dad's is gone now and he was only a bit younger. Wayback machine likely has a lot of them in its index if you can find them.

i went down this rabbit hole and in fact Tim Berners Lee is/was not old (b. 1955), though one can argue George HW Bush (b. 1924) had the White House website running he evidently didn't have a personal one

and then there is Olive Riley (b. 1899) https://en.wikipedia.org/wiki/Olive_Riley