Brain Game: Half as Old as Now?

The mentalfloss.com Brain Game presents: Free-for-all Friday. Good luck!

What is the smallest natural number (positive integer) whose English name contains at least one A, E, I, O, and U?

Here is the ANSWER.

SOLUTION:

ONE THOUSAND FIVE.

Thanks for playing the mentalfloss.com Brain Game. We'll return in four days with Tuesday Test Time. Have a great weekend, all!