actually, my kids were...
4, 9, 13, and 14 1/2. The oldest had won a 3-night trip as an 11 yr.old (just him & one parent, which was me!) So he & I had such a great time, we dragged the whole family there a couple of years later. The 4 yr. old didn't actually remember much about the first family trip, but loved all things Disney ever after. We went again when she was 10, and she certainly remembered every minute of that trip. She's the baby of the family...we went last year to celebrate her high school graduation & getting a full tuition private college scholarship!!! And now we're going back again this year just because we LOVE Disney. All of my kids loved the place, at all the ages...and especially when they got old enough to wander some on their own (best part of staying in the World with teens...) Don't think it's a "waste" to take little ones as long as trip is planned with rest breaks & down time built in. And if your kids are spread out over 10 or more years, well you have to take little ones or your oldest grow up & move out before little ones are "old enough"!