1

Which one is correct?

  1. A six-year-old boy
  2. A six-years-old boy

I see both usage when I search in google.

5

I would say the first one is correct. We say:

The boy is six years old, but He is a six-year-old boy.

The snake is five meters long, but It is a five-meter-long snake.

The pool is twenty feet wide, but It is a twenty-foot-wide pool.

You need to drop the plural to form the adjective.

This page has more information and examples on the same.

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