The only free and comprehensive online etymological dictionary of the Spanish language
edad f. (Noun) "age"

12th cent. From Latin ætas 'id.' From Old Latin aivom "time" (see evo) with noun-forming suffix -tas (see -dad).

Romance: Western Vulgar Latin: Asturian edá, Portuguese idade, Galician idade, Catalan edat, Italian età; Eastern Vulgar Latin: Romanian etate