lasting
permanent
age-old
ancient
antique
auld
ceaseless
coeternal
constant
continual
continuous
dateless
elderly
endless
eternal
eterne
ever-being
ever-durable
ever-during
everlasting
everliving
hoary
immemorial
incessant
indestructible
infinite
interminable
never-ceasing
never-ending
nonstop
nonterminating
nonterminous
of old
of yore
olamic
old
old as Methuselah
old as history
old as time
old-time
olden
perdurable
perpetual
sempiternal
steady
timeless
unceasing
unending
unintermitting
uninterrupted
unremitting
all-pervading
cadaverous
catlike
changeless
clean-shaven
colorless
deathless
dimensionless
disembodied
effortless
emotionless
immutable
imperishable
olive-skinned
owlish
passionless
sharp-featured
sun-browned
unapproachable
unlined
unmoved
unperturbed
untroubled