A period of 30 years is called a "trigennium."
A 30-year-old is more than 30 years old, but not yet 31 years old.
You can call anyone who has lived 100 years a Centenarian.
You call a hundred years a century. If someone lives to one hundred years, that is considered to be quite an achievement.
Individuals within the age range of 30 to 39 years old are commonly referred to as "thirtysomethings."
No, the sentence "She has almost 30 years experience" does not require an apostrophe after the s in the word years. The word "years" is used as a plural noun in this context, describing the duration of experience, so no apostrophe is needed.
Month
I heard that it comes every 400 years.
A millenium.:)
One's girlfriend.
A century.
A triennial event happens every three years.
American
Every 30-31 days is considered a month. (28 in February)The months, in order, are:JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember
an idiotical freak
never cause February only has 28 days and every for years it has 29 but never 30
I think you are asking about a census.
30 years = 3 decades so 1 year = 1/30 or 0.0333... lots of 3 decades.