lat

Lat is the genitive plural of lata, years, which serves as the plural of rok. In records it gives a person's age with mający or liczący, having or counting: lat trzydzieści mający, thirty years old. The ending follows the person, so a woman is lat ... mająca and several witnesses are lat ... mających.

Ages given by a declarant were not always exact, so compare several records before you settle on a birth year. Do not confuse lat with lato, summer: both words share the genitive plural form lat.