Platinum Jubilee celebrations end with doubts about Queen Elizabeth II's future

Prince Charles, Queen Elizabeth II, Prince George and Prince William appear on the balcony of Buckingham Palace.

Extinguish the beacons, take down the stage, roll up the bunting.

The party's over. After four days of parades, street parties and a gala concert celebrating

Queen Elizabeth II's 70 years on the throne,

the Platinum Jubilee celebrations ended Sunday with a queen's

wave from Buckingham Palace and the crowds outside singing "God Save the Queen."

But as the tributes to Elizabeth's lifetime of service begin to fade, Britain is left with the reality that the second Elizabethan age is in its twilight.

The 96-year-old monarch, limited in recent months by what the palace

calls "episodic mobility issues," made only three brief public appearances during the Jubilee.