It really depends on your boys. Yes, bunk beds are labeled for older use. We've had bunk beds for our boys for several years. I honestly don't remember what age we started, but I do know that my almost four year old girl loves it when one of the boys are gone so she can sleep on the top bunk! But she's been exposed to it and is used to climbing up and down. Which reminds me, before we got these bunks for the boys, we used to take trips to the "bunk bed store" (any store with bunks!) and they would practice climbing! That was a good indication to us if they were ready. I would be inclined to go for it if it was me. (Heck, even my barely 2 yo can climb the ladder...not that I want her to, but I don't want to admit how many times she's snuck into the boys room and I've found her reading on the top bunk!). Just consider your own kids...are they good climbers (at the park, etc.), have they been exposed to climbing, do they sleep pretty solid at night or do they get up a lot, if they do get up are they easily disoriented and upset or do they calmly go potty or whatever and go back to bed? All of these things will determine if you feel comfortable doing it early. And don't let other people make you feel like a bad parent or stupid for considering it...only YOU know what's best for your kids!