Abi-Dalzim 6
Aganazzar 21
Bigby 23 Drawmij 15 - Like, I get it, I named my first character, a ranger, Ragnar. I was also six.
Leomund 19
Maximilian 18
Melf 16
Mordenkainen 19
Nystul 15
Otiluke 20
Otto 16
Rary 20 Tasha 25
Tenser 21
Mordenkainen cannot be allowed to drop so far!
I have nothing personally against either Aganazzar nor Maximilian, and yet out of this entire Esteemed Assemblage of Archmages I don't know of anything that warrants them being included in the company of such August Personages.
(I wanted to give some love to Tenser, too, but he seems to be doing alright for now!)