I still play with hot wheel cars... They're fun...
The fact that you still consider him a child doesn't mean he is still 100% a child. He's not an adult, but he's not a child either.
I didn't say that they have to be paired off once they hit double digits, but the assumption adults have of 11, 12, 13 year olds being "children" bugs me a lot, and I see the effects often enough. 12 year old who behave like 6 year olds when their parents are around because their parents treat them like 6 year olds who are otherwise very much capable of behaving in a more mature way. And guess what... All those parents will tell you "I know my child and he/she is still too young/too immature/too much a child" for them to respect the fact that said child is in the process of growing up.
I dunno what to call them, pre-teens, tweens, a 13 year old is a teenager that much is clear. But they are not still children.