"They age quickly."

Translation: Rychle stárnou.

[ErikJRodgers]

I'm curious why "Stárnou rychle" is not correct as well.

[Takis007]

Taky by mě zajímalo co je špatně na "Stárnou rychle"?

[DarrylMose]

I also put "Stárnou rychle" and it was marked incorrect. Is there something wrong with this construct?

[Samir202615]

it is correct. I've also had a mistake in this one, cuz the database doesn't contain that phrase

[JamesA134505]

What do you think about these variants:
"They are quickly getting old."
"They are ageing quickly."

[endless_sleeper]

Those are accepted as well.

[JamesA134505]

So you added them into the system? Because when I tried them they did not work.

[endless_sleeper]

I've added They are quickly getting old. and ageing as a variant of aging.

You are welcome.

[JanVilimek]

"They age quickly" -> I translated to -> "Oni rychle stárnou"
Why is this wrong ?