People who are unfamiliar with the AT imagine that you are going off into the unreachable wilds FOR SIX MONTHS! They’re also bumping smack dab into their own fears. They have no idea how accessible contact is, or the fact that you’re in a town every couple of days except for a very few stretches. Numbers of thruhikers get off the trail briefly to attend funerals/weddings/graduations, heal injuries, whatever.
Not the same situation, but - That’s the image my brother had when I set off in '03; my father was very old, and he feared being unable to reach me for months at a time. He also has a very male protective instinct, which I cherish him for. Our family is close. I’m his only remaining sibling and family member to boot. I respected his fears, but I didn’t let them dictate my outcome.
I cc’ed my brother on every journal entry, so he always knew where I was. He had the ATC number and instructions to call if he needed me and tell them where I was, and they would get word to me quickly (you have no idea how quickly someone can be pinned down in an emergency). I called home and spoke to dad every town. My brother’s friends got wind of my trail journal and started reading it and were telling him daily how cool it was. I got off the trail in Vermont to attend his wedding. He came around, and to this day remains proud of his OLDER sister.
If you have a sound marriage, and good communications, and are at a natural transition point in life, you can make this work. Lots of married people hike the trail each year. As for temptation, unless you’ve done a long hike you have no idea how exhausted us OLDER people are at the end of the day.
Your best bet is to get hub to a Gathering. Very much of a family atmosphere, and he’ll catch the buzz with the slide show and the conversations and inclusiveness. I would NOT suggest Trail Days as a first event!

Bedrock Bob is trolling, no need to bite, eh?
Jan LiteShoe