Yes
Twenty 3 year olds would like twenty Barbies.
There's 20 of them.
If he or she is mature
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.
mostly mature nine year olds or ten year olds through 29 year olds though there are twilight moms and twilight grandmothers.:)
definitely not, even if hes mature
Yes.
1. that is not funny 2. your acting like three year old 3. sorry because that's insulting three year olds because they act more mature then you. *
yes they will only if you are mature
well that depends if they are mature or not
it depends on how mature the kid is if immature no if mature yes
By the rating (Mature), no ten year olds could buy or play GTA IV.