wait til your older
There isn't a suffix for ten because there is no base/ root word.
Can ten year olds use sensa
yes ten year olds can play with dolls even 11 year olds can
Yes, ten year olds are considered tweens
You seem to be having trouble figuring out which word is the noun that needs to be the plural. Which thing do you have more of - twenty, year, or old? Twenty years is the modifier for old. You have two twenty year olds.
Yes
Party favors that are good for ten year olds are cartoon character stuff and good decorations.
No
mostly mature nine year olds or ten year olds through 29 year olds though there are twilight moms and twilight grandmothers.:)
By the rating (Mature), no ten year olds could buy or play GTA IV.
not always because some ten year olds are quite big
Yes, on YouTube there are numerous videos with ten year olds doing backflips.