abidingness
advanced age
advanced years
age
age of retirement
an incurable disease
anility
animal spirits
animate existence
animation
antiquity
being alive
birth
caducity
constancy
continuance
debility
decline of life
declining years
decrepitude
defeat of time
defiance of time
diuturnity
dotage
durability
durableness
duration
eld
elderliness
endurance
existence
feebleness
green old age
hale old age
haleness
hardiness
having life
heartiness
hoary age
immortality
infirm old age
infirmity
infirmity of age
lastingness
life
lifetime
liveliness
living
long life
long standing
longness
oldness
longevous
agility
alertness
cleverness
fecundity
fertility
flexibility
permanence
productivity
profitability
quickness
resilience
resourcefulness
solidity
stamina
tenacity
toughness
usefulness
versatility
virility
vitality
well-being
brevity