My father still updates his website with Frontpage (he had a recent 6 month outage because he inadvertently deleted the Windows XP vmdk on his system, but I recovered that for him recently.) He’s 75, and isn’t interested in converting or learning anything new at this stage.
The funny thing is for years his home-made site was the top google hit if you searched for “hill's criteria” (See Hill's criteria of causation). His site is http://drabruzzi.com/