This is hilarious, but I’m pretty sure that the spell prevents him from aging. So the beast/prince adam wasayoung man and chip wasalittle boy when the spell took hold.Ithink the rose STARTS to wilt when he turns 21, then he has until the last petal falls before it becomes permanent. It’s never explained how long it takes from the time the rose begins to wilt until the last petal falls. It could have been 10 years since it’s an enchanted rose. Also,Ithink that Belle uncovering and touching the rose could cause the petals to fall more quickly.