forty · number
(be) in your forties/40s
B2 to be aged between 40 and 49
Dictionary examples:
By the time I'm in my forties, I want to be running my own business. (31.1)
the forties/'40s
B2 the years 1940 through 1949
Dictionary examples:
Most of these people were born in the forties. (39.8)
forty
A2 the number 40
Dictionary examples:
I have forty excuses for not doing my homework! (0.0)
I waited forty minutes for the bus, then walked home! (0.0)
I ate forty cookies and now my tummy hurts! (0.0)
He looks about forty. (3.6)
thirty, forty, fifty (4.2)