Retire? Bite your tongue.

For your information, you and I have a lot in common age wise.
Why did you stop using DOS 3 and that wildcat BBS and move to FrontPage? Sounds like "the powers that be" at FrontPage offered you a better way to do things, and you jumped. That time has come again. Actually, it came years ago and it sounds like, you ignored the call. That's ok, many did. The Frontpage Blockers have now been put in place to get the last of you "old timer hobbyists" off them. It's for the best.
11.46 FrontPage® Update Blocker - cPanel Documentation
There's really nothing new to learn here for you, you'll just need to edit your site in a different way going forward. Here's one of those ways:
Web Disk - cPanel Documentation
Have you got one of these fancy smancy mobile devices? You might like to know that you can edit your site using one of those these days now, too!
cPanel Web Disk - iTunes
cPanel Web Disk - Google Play
Retire? NEVER! There's too many cool things to learn and take part in. Don't stop now, its just starting to get good.
Security is very important. Ever have your site hacked, destroyed, needed to restore it from a backup? If yes, then your question is just plain silly.
When you have time, spend it on google, asking your question there:
what makes Frontpage insecure
cPanel no longer supports FrontPage. They did for far too long after they shouldn't have been. And have now finally, taken steps to kill it outright, once and for all.
From one old timer hobbyist to another, take a closer look. Grab a cup of coffee and do some reading. Times have never been better for gents like you and I.