He started in san francisco and arrived in japan almost three years later.
which type of noun is represented by the boldfaced word?
the boldfaced word is years.

The answer is - years is a common noun.

A common noun is a word that names a place, person, thing or idea but is not the actual name of someone or something. They are usually not capitalized unlike proper nouns. So for example 'girl' is a common noun and 'Rose' would be a proper noun which is an actual name.  

who is marty in this situation?

free points are committed here! first to answer by writing this question and post it as an answer gets brainliest and everybody gets 30 !