Differences are..
If years is used as noun preceding an adjective it would be used in plural form because the year is a countable noun.
For example...
A) my daughter is thirteen years old....in this sentence the old is adjective and years is noun.
(B) The above situation is distinguished with, there are two 63-year-old men in the meeting room. in this sentence the year is an adjective as
The difference between the "n" and the "ñ" is VERY important here. Ano means "anus". "Año" means "year". Obiviously, you do not want to get these confused.
About ten grand a year and a set of dentures.
The job belongs to last year as it was, so it is a possessive. So there is an apostrophe needed between year and s, so it does not indicate a plural. The correct form is: Last year's job.
B.C. stands for the years Before Christ. This designation was given many years after His death and the year of Christ's birth is actually estimated to be between 3 and 6 A.D.
4 years
"Year's" is the possessive form of "year" and indicates that something belongs to one year. For example, "the year's end." "Years'" is the possessive form of "years" and indicates that something belongs to multiple years. For example, "the years' worth of memories."
90 years
A year is 365 days and a century is 100 years. A millenium is 1000 years
The next palindromic years are going to be 2112 and 2222. There is a 100 year difference between the two.
4 years.
Remembering that there was no year zero, the answer is 2105 years.
Remembering that there was no year zero, it is 4509 years.
The current year is 2016, 100 bc was a hundred years before Christ was born.There are 2116 years between the two dates.
There was no year zero, so the answer is 29 years.
Remembering that there was no year zero, the answer is 799 years.
Remembering that there was no year zero, it is 2959 years.
The correct grammatical expression is "this year's recipient". It is then a clear declaration that the "recipient" belongs to "this year".