Lewis Short
(adjective) : prīmaevus, a, um, [primus-aevum
* In the first period of life, young, youthful (poet. and late Lat.): primaevus Helenor,Verg. A. 9, 545: natus,Cat. 64, 401: Helix,Val. Fl. 6, 570: vix primaevus eras, cum, etc.,Claud. I. Cons. Stil. 1, 51: corpus,Verg. A. 10, 345; Luc. 6, 562: corpora,Val. Fl. 2, 653: flos,Verg. A. 7, 162: recepisti primaevus originis tuae florem,Amm. 15, 8, 11: adulescens,id. 16, 1, 5.
Charlton T. Lewis, Charles Short, A Latin Dictionary