"becoming or become young again," 1763, from Medieval Latin rejuvenescentem (nominative rejuvenescens), present participle of rejuvenescere "become young again" (see rejuvenescence).
Entries linking to rejuvenescent
rejuvenescence n.
"renewal of the appearance, powers, or feelings of youth," 1630s, from Latin rejuvenescere "become young again," from re- "again" (see re-) + juvenescere "become young," from juvenis "young" (see young (adj.); also see -ence).