Where does “h₂yuh₁en-” come from?

h₂yuh₁en- (Proto-Indo-European) comes from Proto-Indo-European h₂ey- — vital force, life, age, eternity; day, morning.

h₂yuh₁en- (Proto-Indo-European): young

Definitions

Step	Language	Word	Meaning
1	Proto-Indo-European	h₂ey-	vital force, life, age, eternity; day, morning

h₂yuh₁en- — Etymology, Origin & Word History | Etymology Explorer