Whatever age the monarch is they will not be 'relevant' to some age group or another. If the monarch is in their 20s they will antagonise the older people by not understanding and the other way round if the monarch is old are old.
The monarchy doesn't work on the basis of who we would most like, at one point in time,or who is the best of the bunch. It works on primogeniture. the eldest child of the sovereign succeeds to their parent and stays there until they die.
That way we get a head of state who is completely uncoupled from politics and popularity polls. It is this that makes a monarchy so different from an elected head of state who will, by necessity have been in the public eye for what they have done in their own name and who is often an ex-politician, and elected for who they are. This also means that they cannot be seen as being totally impartial.
Our current monarch has dealt with governments of many different complexions over the years, without regard to their political allegiances. She has been willing to greet country leaders of every kind from the best to the worst (someone said to day the worst was Nicolai Ceasescu, the communist tyrant of Rumania, and the Queen at one point disappeared into a shrubbery to avoid him when she saw him coming when taking a walk during his visit).
So king Charles it will be and it is best that we can only like it or lump it.
)
