She is a fifty-something woman who loves to travel.

She is a fifty-something.

She is a sixty-something woman who loves to travel.

She is a sixty-something.

She is a forty-something woman.

She is a successful forty-something.

She is in her ninety-something years.

She is a ninety-something.

I have a hundred-something books on my shelf.

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