I built models as a kid, then stopped in my teens and didn't really get back to it for many years (got sidetracked by the usual... girls, then a marriage, then three kids and working to support them. I had no time for hobbies!). Got back to it again in the 90s as an adult, once the kids were older and I actually had the time to have a hobby again. I've been at it ever since, but not steadily. I go for long periods where the urge just doesn't hit me, then I get the urge and suddenly I'm back to building... but I can easily go for many months at a time without touching a model at all.