What seemed to be the case for a lot of people was they thought their little side was 1 or 2, and found it got older, like 5 or 6. I was the opposite. I started at 4 year old who needs diapers, and would now say I'm like 2 or 2 and a half. Sometimes I like to be an infant too, but rarely. And I still enjoy being a diapered preschooler. But I'd say I'm normally right in the middle.