What Half Banana said.
It's really quite sad - I'm on the far end of middle age, and I think of all the JW adults that I knew as a kid, hundreds of them, all believing they would literally "never grow old".
Now, they're all dead, or dying, or suffering from dementia. It's probably worse for the handful still mentally aware - imagine that you literally believed you'd never grow old - and here you are, 80 or 90, broken body, pain, grief, knowing you've got at most a year or 2 of misery & pain left before you too die....