But that's not likely to happen. The Queen is vehemently against abdication, and one of the reasons is the effect it had on her father when he was made king because of Edward VIII bailing out. So, given she's not going to abdicate it's hardly likely Charles is going to turn round and abdicate...
I feel sorry for Charles. He's having to perform the day-to-day duties of a monarch without having the title.
The Queen clearly is going to remain Queen until she dies which, given her mum died at c. 100 and other members of her family have also reached the century, means another 13-odd...