"They are sixteen year olds."

Translation: Sono ragazzi di sedici anni.

[ceceg]

It would have been nice to have seen the word "sedicenni" (sixteen-year-olds) before this exercise appeared. It was impossible to guess based on the dictionary hints and previous lessons.

[magofa]

Why not loro hanno sedici anni?

[wiplala]

you are right, it is correct too and should be accepted. Did you report it?

[fsufezzik]

It is accepted now, January 23, 2014.

[robert0n]

Thanks for letting us know.

[robert0n]

I'm wondering this too. Sounds like a good translation but maybe not idiomatic?

[marliner]

Yet another idiomatic expression tested without any prior introduction.

[fournier49]

"Old" without an "s" !!! and perhaps "year" with an "s" ...???