This is from how the medical community describes age and developmental milestones for small children. It feeds over from that into how parents describe their child's age since all parenting and medical literature you encounter does the same thing.
I think it's fine till the kids 2, since that's when doctors start going by years. After that, you're just being weird.
I think it's fine till the kids 2, since that's when doctors start going by years. After that, you're just being weird.