There is a body of opinion which suggests, that as Charles may be well into his 70s when he inherits, he should then immediately abdicate in favour of William. It is possible (Edward VIII did it). I would support such a move, and think it would be popular.
There may well be a 'body of opinion', but that's not how it works! And I suggest strongly that the sad case of Edward VIII was a one-off aberration, not a justification for random abdications that run contrary to the established line of succession. Prince Charles may indeed become an old [and brief] King ... or he may not: his father still seems to be going well. To suggest that because he may be in his 70s he should abdicate the throne in favour of Prince William is so outrageously ageist that I'm surprised you subscribe to it!!
Of course, the tabloid Press would prefer pictures of a virile young King* and his pretty young Queen. Well, that's their bloody problem! It will be Charles and Camilla, whether they like it or not
* Whatever next? Abdicate on the grounds of baldness?