Eve is 27 years old
Eve Torres is 27 years old.
Literally, the old night. Used for New Years Eve.
newspapers
Eve => night before => New years eve => night before the new years day.
New years eve is in december
New years eve.
Who is perfroming in times square at new years eve 2013
The eve, e.g. the night before New Years Day is New Years Eve.
Eve Bunting was born in 1928 and is 82 years old in 2010.
The correct way is to write New Year's Eve.
Yes, when it is New Year's Eve or New Year's Day. They are possessives, as in the day that belongs to a new year. If you are talking about plurals, then there is no apostrophe, like "New years are not like old years".