lifeling
delta particle
shortliver
near-term
lowlifer
macrobiosis
ephemeral
transient
fugacious
passing
short-lived
transitory
eat, drink and be merry for tomorrow we die
sojourn
midget
stopgap
transiently
vertically challenged
close
inanimateness
wee
brachy-
lifelessness
little
survive
longevism
brevi-
shy
outlive
brace of shakes
kill
outlast
in perpetuity
in two jumps
lived
innings
neonatal mortality
neonatal mortality rate
natural
brief
in the short run
stone's throw
step
overlive
longevity
basal
cyclogenic
nickel and dime
instant
momentary