Is white or black tea more caffienated?

I’m almost completely positive black tea has more caffeine. White tea is the youngest, followed by green, then red and black, I believe. As the tea ages on the plant and oxidizes the caffeine concentration increases.

Black tea has more caffeine than any other tea (now, I am talking proper tea here, not herbal or bark). I personally feel that Yerba Mate packs more of a punch, but it is not from a tea leaf. It also has more than just caffeine as a stimulant.