seventy · number /ˈsev.ən.ti/
seventy
A2 C the number 70
Dictionary examples:
sixty, seventy, eighty
This house was built seventy years ago.
Learner example:
It cost seventy pounds. (Key English Test; A2; Spanish)
(be) in your seventies
B2 to be aged between 70 and 79
Dictionary example:
Both my parents are in their seventies.
Learner example:
After some minutes, an old man in his late seventies opened the door and told us in his trembling voice that Daisy wasn't at home. (First Certificate in English; B2; Italian)
the seventies
B2 the years from 1970-1979
Dictionary example:
I grew up in the seventies.
Learner example:
The nineties is, indeed, a reverse of the seventies. (First Certificate in English; B2; Swedish)