Lewis & Short

pŭĕrasco, ĕre, v. inch. n. [id.].

  1. I. To attain the age of boyhood or youth: unus jam puerascens insigni festivitate, Suet. Calig. 7.
  2. II. Transf., to grow young again (post-class.), Aus. Idyll. 4, 55; Claud. Mamert. Stat. Anim. 1, 1.