I have a hundred-something books on my shelf.

She is in her seventies, but she still has a lot of energy.

She is a seventy-something.

She is in her eighty-something and still going strong.

She is in her eighty-something and still going strong.

She is a twenty-something woman.

She is a twenty-something working professional.

I just want to get this over with.

I have it on good authority that the company is going to announce a new product next week.

That is something I never expected to happen.