English
juvenescence
By surface analysis, juven(ile) + -escence.
Equivalent to juvenile + -escence
Proto-Indo-European *h₂ey- ‘vital force, life, age, eternity’
…
Proto-Indo-European *h₂yéwHō ‘young’
Proto-Italic *juwō ‘young’
Latin iuvenis ‘young’
Latin iuvenīlis ‘youthful’
English juvenile
Today it means
noun Especially of one's mind or spirit, the state of becoming young or juvenile.
Language periods are conventional ranges, not dates for this word.
Etymograph / juvenescence