Answer: timeless

AnswerCrossword Clue
TIMELESSImmortal
TIMELESSEternal
TIMELESSEverlasting
TIMELESSInterminable.
TIMELESSEternal.
TIMELESSUnchanging.
TIMELESSSeth Thomas, hardly ever
TIMELESSUnending
TIMELESSEternal '78 Isley Brothers album?
TIMELESSAlways relevant
TIMELESSSuitable for all ages?
timelessNot affected by the passage of time or changes in fashion
timelesshaving no beginning or end