child	dziecko
children	dzieci
elderly	starszy (pan, pani)
in his early twenties	po dwudziestce (on)
in his late thirties	przed czterdziestką (on)
in his mid fifties	około 45 lat (on)
middle-aged	w średnim wieku
old	stary
teenager	nastolatek, nastolatka
young	młody