Lewis & Short

ădŭlescentĭa (not ădŏl-), ae. f. [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.