Yes, there should be hyphens in "thirty-year-old" when used as a compound adjective before a noun. The correct phrasing would be "a thirty-year-old civil war." The hyphens help clarify that "thirty-year-old" is a single descriptor for the civil war.
There were not 36 wars between Athens and Sparta.
1861-1865
spanish
The Thirty Year War lasted 30 years. From 1618-1648.
The civil war between Caesar and Pompey started in 49 BC when Caesar crossed the Rubicon and invaded Italy. Pompey was given dictatorial powers at this time.
No.
Yes
No it doesn't require to be hyphenated.
There is a hyphen in phrases like "100-year", because they precede whatever they are modifying, like a "100-year flood". In general, two-word phrases are hyphenated when they are used as adjectives and precede the term they modify.
There were not 36 wars between Athens and Sparta.
George Beniski a thirty-two-year-old Polish immigrant
B
If you're using the phrase as an adjective (example "I hate the end-of-the-year audit!") then it will definitely need the hyphens. Otherwise, the hyphens are incorrect.
In the year 2011, the thirty-fourth complete week occurs between August 22 - 28.
Four-year should be hyphenated but not institution.
Between ten and thirty pounds per year.
In 1618 with a conflict between Bohemia and the emperor.