Prince Charles has turned 70 - a milestone for many, but when you're the heir to the throne, age is more than just a number.

Charles' birthday has raised the question amongst commentators who wonder if he should succeed his mother, The Queen, when she dies or, less likely, abdicates. 

A new poll released this week ranked Charles as only the seventh most popular royal, behind his two sons and their wives. In the week of his birthday, it has again raised the suggestion that the crown should pass next to Prince William instead of Charles. 

Having being the heir since he was four years old, Charles holds the record for the longest reign as heir, at 66 years. 

Andrew Dickens took aim at those who think he should stand aside, arguing that there is no one more experienced for the job. 

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