I've been asked a few times recently whether or when I think the Queen is likely to abdicate. I know this issue is debated in the UK too (though I think less than it was maybe 10 or 20 years ago for some reason).
Personally I don't think the Queen has any intention of abdicating, nor do I think there is any reason she should. But I also don't think that everyone realises quite what a precedent such an abdication would set.
There has been only one voluntary abdication in English history (that of Edward VIII). Prior to that, Richard II was forced to give up his crown to Henry Bolingbroke (Henry IV)in 1399 and James II also gave up the throne (in practice if not quite in his own mind) when he fled from William of Orange in 1688.
No monarch has ever given up the throne for reasons of old age or ill health. In times when the monarch took a more active role in government, Regents were appointed but these could not usurp the God-given right of the monarch to hold the throne and demand the loyalty of his or her subjects.
Now it is true that life-expectancy has increased, making a late accession more likely. If Elizabeth II reaches the same age as her mother (102) then Charles will be 80 when he succeeds. I suppose it's possible that at that point he might choose to refuse the crown, in favour of his son, though I suspect that, having been waiting for so long, he'll jump at his chance.
These are ancient institutions and rules of inheritance, not to be lightly overthrown. I hope and expect that long after we've rejected the tyranny of modern democracy, we'll still have a King or Queen to rule us in accordance with God's law and pattern.

http://www.christandcovenant.blogspot.com
01/02/07 @ 13:29