adverb, noun which may take the genitive case particle 'no', noun
a few years later; several years later
Used as an adverb or with の to modify a noun. Refers to a point in time a few years after a reference event.
数年後、彼は社長になった。
A few years later, he became the company president.
これは数年後の計画です。
This is a plan for a few years from now.