immaturity
earlier
preassociativity
pubescence
prematuration
sooner
prehensility
pretannage
preinitiated
before someone's time
get up with the chickens
rear
anticipate
precandidacy
foretaste
preopening
youthhood
predelinquency
early days
rathe
go off half-cocked
predestinarian
prevenience
go off at half-cock
juvenescent
prime
early to bed, early to rise, makes a man healthy, wealthy and wise
predestinative
precipitantness
predicativity
infancy
preincubated
babyhood
rejuvenation
prereproductive
childliness
puerility
go to bed with the sun
childhood
go to bed with the chickens
neanic