hyphens between numbers

British (BBC & Times) style: 18 to 34-year-old audience
American (NYTimes & CNN) style: 18-to-34-year-old audience

paco

I'm afraid that I would write 18- to 34-year-old audience. No apology or explanation.

Hello MM

I feel this question is somehow tricky. Most of CNN and NYTimes reporters write like '12- to 15-year-old girls' when the noun can take a genuine plural form. But in the case of 'audience', a collective noun, they seem prefer to write '12-to-15-year-old audience'.
paco

I guess I can see where they are coming from, Paco-- the girls are individuals, from 12-year-olds to 15-year-olds, but the audience is an uncountable clump of people from 12 to 15. Still, I think they may have confused it a bit with the concept of a range of group members, rather than a range of ages (since the audience itself is only an hour or two old), but I shan't press it-- it's getti

hello, I have a question :

How would I hyphenate the following sentences: The tower was built in the late nineteenth century? And also, "The tower was built during the late nineteenth century's post-Civil War period?

The tower was built in the late nineteenth century. No hyphenation.

The tower was built during the late nineteenth century's post-Civil War period. Again, no hyphenation needed, beyond the one you have already supplied.