Dutch Queen Bea did it last year. Now King JC of the Spanish posse. Come on Lizzie pet. You know it makes sense.
You are assuming that Charlie boy kicks the bucket in that time then, the monarchy would still go to Charles and Cammila if the queen abdicates.
He would have the option to take it or by pass it though. I reckon she'll go on for another 3 years, get to 65 then Charlie will take over for about 5 years, just to say he's done it, then Billy, just in time for corrupt Qatar.