lifeling
delta particle
shortliver
near-term
lowlifer
macrobiosis
transient
transitory
passing
short-lived
ephemeral
fugacious
eat, drink and be merry for tomorrow we die
sojourn
midget
vertically challenged
stopgap
transiently
close
wee
brachy-
inanimateness
little
lifelessness
outlast
brevi-
in perpetuity
kill
brace of shakes
shy
longevism
survive
outlive
in two jumps
lived
innings
neonatal mortality
neonatal mortality rate
natural
in the short run
step
stone's throw
brief
basal
longevity
overlive
medium-term
no-life
shorthandedness
instant