I had two girls by a first marriage, and took them on day hikes and backpacks from the time they could walk. But when they got to middle school, they were pretty much done with backpacking. We went on a backpack each year, but they were not really into it.
New marriage, and as a couple we had a more unified interest in outdoors stuff. We had a girl and a boy, and did car camping till my son was 6, when we did his first overnight.
Thereafter, we did more and more backpacks each year. When daughter #3 was 16, she said "no more backpacks, ever". We went on one last one, with her sister, my #2 daughter, by then 26. They both were bored, but had a great time in spite of themselves.
After the trip, #3 daughter said "now I get it Dad. I'll go on a backpack with you anytime I can. We are planning one for this summer.
My son joined scouts when he was 11, and he's 16 now. Scouts was a great venue for father son backpacks, and we are still getting out on them, with some trip reports here.
I just heard from daughter #2, a senior in college, that she is going on a camping trip with friends at college. So I guess her boycott wasn't "forever".