A swelling stream of literature employs age-heaping as an indicator of human capital, more specifically of numeracy. We re-examine this connection in light of evidence drawn from nineteenth century Italy: census data, death records, and direct, qualitative evidence on age-awareness and numeracy....

Age data frequently display excess frequencies at round or attractive ages, such as even numbers and multiples of five. This phenomenon of age heaping has been viewed as a problem in previous research, especially in demography and epidemiology. We see it as an opportunity and propose its use as...