Old Henry

How old was Henry ll of France?

when he started his affair/romance with Diane de Poiters?
I thought Diane was born 1499 and Henry 1519 making them a 20yr age difference, thats why I was curious.

I believe his affair with Diane started shortly before he married his future queen Catherine, he was about 12-14 and Diane was well into her thirties.

9 Year Old Henry Plays a Moszkowski Etude (Again)