Stepping in for the queen has become more common in recent years as Elizabeth, 87, has greatly reduced her international travel. Her husband, Prince Philip, 92, has also reduced his public appearances following a series of medical setbacks.

Over his decades as heir, Charles has become known for his strong opinions on topics such as education, architecture, religion, the environment, organic food and homeOpathy.

Little said the prince was enjoying his relative freedom to speak out before he becomes king, a role that will require him to be much more cautious in his pronouncements.

"I think he's very much making use of the time available to him in that he can put forward theories and get things done that he won't be able to do when he becomes king," Little said.

Charles has also celebrated his birthday by serving as guest editor of a special edition of Country Life magazine, which shares his enthusiasm for preserving Britain's rural areas.

Charles used his stint in the editor's chair to upbraid supermarket chains for taking advantage of Britain's small farmers and said Britain's farming heritage is at risk.

Questions:

1. How old is Prince Charles?

2. What will happen at his next birthday?

3. What milestone did he pass 2 years ago?

Answers:

1. He turns 65 on Thursday.

2. He qualifies for government pension.

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