Rome, December 19 - Italian residents are, on average, 43 years old, Italian statistics agency ISTAT announced on Wednesday, citing findings of the 2011 Italian census. Aging of the population is particularly noticeable in the Liguria region, which includes Genoa, and in Friuli-Venezia Giulia, the Italian region located next to the Slovenian border. The average age of residents in these two regions is 48 and 46, respectively. People are younger - an average of 42 years old - in the southern regions of Calabria, Puglia and Sicily, as well as in the northeastern region of Trentino-Alto Adige. The youngest average age is found in the southern region of Campania, which includes Naples and has an average age of 40. In Tuscany, Umbria, Piedmont and Emilia-Romagna, the average age is 45 years old.