Lewis Short
ădŭlescentĭa | ădŏl- (noun F) : (not ), ae. adulescens
* The age of the adulescens, the time between the age of the puer and juvenis, i. e. from the 15th to the 30th year, the time of youth, youth, = ἐφηβία, ἡλικία (cf. adulescens): quid enim? Citius adulescentiae senectus quam pueritiae adulescentia obrepit?Cic. Sen. 2: qui adulescentiam florem aetatis, senectutem occasum vitae velit definire,id. Top. 7, 32: Nemo adulescentiam tuam contemnat,Vulg. 1 Tim. 4, 12: ineunte adulescentia,Cic. Off. 2, 32: jam a prima adulescentia,id. Fam. 1, 9 fin.: ab adulescentia sua,Vulg. Gen. 8, 21: in adulescentia = adulescens,Suet. Claud. 41.
Charlton T. Lewis, Charles Short, A Latin Dictionary