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Webster 1913 Edition

Adj.

[AS.

geoguðlic

Young; youthful.

[Obs.]

“All my youthly days.”

Spenser.

Adj.

Young; early in life..

youthly ‎(comparative more youthly, superlative most youthly)

(archaic) Youthful.
- 1590, Edmund Spenser, The Faerie Queene, I.xi:
  he hath left his plumes all hoary gray, / And deckt himselfe with feathers youthly gay [...].