@YARNLADY Here are my thoughts on the speculation. Queen Elizabeth turns 90 this month. Since she is still in relatively sound mind, it’s more likely that she will maintain the title until her death. Should she be unable to carry out the few responsibilities held, there are trained advisors, including her son Charles, that can carry them out on her behalf.
Being king or queen is vastly different than holding a job. It’s a birthright. Thus, the role is different than retiring at a certain age. The the royal families are groomed from birth regarding expectations of their titles. To abdicate is different than retiring. Abdicating holds a negative connotation; it’s rarely done only out of personal choice but from negative social pressure.
So will Charles abdicate when the time comes? The scandal of his continued affair with Camilla during his marriage has lessened over time for a variety of reasons. If forced to guess, it would be that he does’t.