Daily Brain Teaser #24

Today is Rachel's Birthday! Use the clues to find out how incredibly old she is.

Rachel's age is a two-digit number. One of the numbers is even and one of the numbers is odd.

If you add the two digits, the sum is 9

If you subtract one digit from the other, the difference is 1.

Rachel is not yet half a century old (although her boyfriend is).

How old is Rachel? _____