She is aged seventeen.

She's seventeen.

She's seventeen years old.

Source: Tatoeba

Helen is seventeen years old.

Source: Tatoeba

I'll be seventeen next year.

Source: Tatoeba

She got married at the age of seventeen.

She got married at seventeen.

She got married at the age of 17.

Source: Tatoeba

My friend is seventeen years old.

My friend is seventeen.

Source: Tatoeba

She will be seventeen next year.

Source: Tatoeba

He left high school at seventeen.

Source: Tatoeba

Much of London was destroyed in the seventeenth century.

Source: Tatoeba

The wedding will be held in a 17th century church.

Source: Tatoeba

A boy of seventeen is often as tall as his father.

Source: Tatoeba

And the ark rested in the seventh month, on the seventeenth day of the month, upon the mountains of Armenia.

Source: Tatoeba

She was born at six a.m. on July 17, 1990.

Source: Tatoeba

Meetings are to be held on the afternoon of July 15 (Tuesday), all day July 16 (Wednesday), and the morning of July 17 (Thursday).

Source: Tatoeba