survivorship
adultivity
neoteny
age distribution
youth bulge
pedomorphism
infrapopulation
nineteenness
emotional age
juvenile
juvenileness
peramorphosis
microgeneration
gen
have one's whole life ahead of them
paedomorphic
multiage
removed
underage
intergenerational
neotenous
generationally
dependency ratio
juvenilize
intragenerational
transyouth
young money
quarterlife
matureness
clinicodemographic
35
age
youthless
sandwich generation
xxxv
beat the clock
juvenescent
thirty-five
baby boomlet
fourteenness
overage
-geny
immaturity
population profile
agewise
adultescence
Gompertz distribution
intergen
subgeneration
intergenerationally