Would you take your child at 3.5 or 4.5? You can only choose one. My parents want us all to go to Disney World at some point. We're trying to decide if we should go at 3.5 or 4.5. Will she sort of remember it if we go at 4.5? This would be a big vacation for us - we don't typically go on expensive vacations. When we vacation, we stay with family and spend very little.