2.4 old and young
senex (usually noun) old; old man; comp. senior, older; noun senectūs, old age; adj. senīlis
nātū grandis, old; māior, māximus (with or without annīs or nātū), older, oldest
quot annōs nātus es? how old are you?; annōs XXX nātus sum or vīxī
aequālis, of the same age
iuvenis (usually noun), youthful; one in prime of life; comp. iūnior, younger; noun iuventūs, youth
nātū (or annīs) minor, minimus, younger, youngest
parvus, young, e.g. parvī līberī
q.v. ages of man, 24.2
from A Handbook of the Latin Language by Walter Ripman (1930). Transcribed by Carolus Raeticus (2011).