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False

YEARS is a countable noun in the plural form. It is not a verb. 

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True

Year is a noun, as you can count the units (one, two, three years...) it is a countable noun. If you want to make it plural, just add "S". 

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True

THAN is classified as a conjunction and a preposition. It is mostly used in comparative sentences. 

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False

A is an article. It can be used with either singular and uncountable nouns. It means "one".

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True

AT is a preposition. It indicates location, position, etc. 

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