Lexical Definition

‎νεότης‎ neótēs (neh-ot'-ace) youth ^G:N-F
from ‎νέος‎

youth.

• newness, i.e. youthfulness

Abbott-Smith

νεότης, -ητος, ἡ (< νέος), [in LXX chiefly for נְעוּרִים;]
youth: Mk 10:20, Lk 18:21, Ac 26:4, I Ti 4:12.†

Abbott-Smith References

Liddell-Scott-Jones

νεότης,

Doric dialect -τας, ητος, ἡ, (νέος) youth, ἐκ νεότητος.. ἐς γῆρας [NT+8th c.BC+]; ἐρατὴν γὰρ ἀπωλέσαμεν νεότητα, i.e. we died young, [Refs 5th c.BC+]; ἐν νεότατι, ἐπὶ νεότητος, in one's youth, [Refs 7th c.BC+]; αἱ ν. ῥωμαλέαι[Refs 4th c.AD+]

__2 youthful spirit, impetuosity, [Refs 5th c.BC+]: in bad sense, youthful folly, insolence, ἀκολασίᾳ καὶ ν. [Refs 5th c.BC+]
__II collective, ={νεολαία}, body of youth, especially of military or athletic age, [Refs 5th c.BC+]
__III in Crete, νεότας, ἁ, accusative νεότα, genitive νεότας, board of officials representing the νέοι [Refs 3rd c.BC+]

_{LSJ Scripture Refs: Mark.10.20}