Oh yes, we also have other parts than our current body age (32). Age gets kinda screwy because the kids all think of themselves as being old and having no age. I can sorta tell what age category they fall into, but there are no fast borders on those.
Then Latifa is like early 40's and has certain maturities that the rest of us do not and cannot speak about) and narrator is older than us, but again no real age and is what the name implies.
The kids HATE being asked their age. they feel like adults and hate anything that suggests otherwise. It took me years to understand that our SI part was really only 10. @_@