[f. as prec. + -NESS.] The fact or quality of being youthful; youthful condition or character.
1587. Golding, De Mornay, viii. 117. Should we rather graunt an euerlasting ignorance in man, than a kynd of youthfulnesse which hath learned things according to the growths thereof in ages?
1622. Mabbe, trans. Alemans Guzman dAlf., II. 139. He might either doe it out of youthfulnesse or out of want.
1717. Addison, trans. Ovids Met., III. Wks. 1726, I. 213. With all the purple youthfulness of face, That gently blushes in the watry glass.
1840. Dickens, Old C. Shop, i. Her very small and delicate frame imparted a peculiar youthfulness to her appearance.
1898. H. S. Merriman, Rodens Corner, xii. 124. A complexion almost dazzling in its youthfulness and brilliancy.