When you're president of the United States, you deal with the other world leaders you have, not the ones you might wish to have, to paraphrase Donald Rumsfeld.
We were reminded of that this week, when we saw screen grabs of video footage of North Korean leader Kim Jong-il addressing a memorial for his late father, state founder Kim Il-sung. Not too put too fine a point on it: He don't look so good. Kim, 67, believed to have suffered a stroke in August, looked thin, old and tired. His once-parodied bouffant hair had given way to baldness.
Leadership transitions, particularly in authoritarian states, can be perilous times, as North Korea demonstrates. It's been lighting off missiles, conducting nuclear tests and stepping up its bombastic rhetoric in what at least some analysts say is an effort to show strength while Kim arranges a succession to his son.
All this got us thinking about potential leadership transitions elsewhere. That don't look so good either. In some of the most sensitive spots around the world, leaders are, not to be macabre about it, getting on in years.
Moving on from North Korea, we come to the Middle East, where Saudi's King Abdullah is 85 years old, albeit reportedly in decent health. Abdullah has been an important behind-the-scenes ally to the United States, pushing, however slowly, for reforms in the Kingdom, while also trying to advance the Middle East peace process and counter influence from Iran and Syria in Lebanon.
Also in the Middle East is Egypt's Hosni Mubarak, at 81 a spring chicken compared to Abdullah. Say what you will about Mubarak, he's managed to hold Egypt together for 26 years since the assassination of Anwar Sadat. What will happen to the Arab world's most populous country, and home to the Muslim Brotherhood movement, after he's gone, is anybody's guess.
Closer to home is Cuba, where Fidel Castro, in declining health for several years now, is 82, and his brother Raoul, now the country's president, is 76. 'Nuf said. Commentators have been predicting the Castros' demise for decades, and we'e not going to go there.
The leaders of Burma, Kuwait and many other places are well into their '70s and '80s. But the prize goes to Zimbabwe's Robert Mugabe, born February 21, 1924, and like Saudi's Abdullah, 85 years old.
So, change, for good or ill, lies ahead for some pretty important countries and for President Obama.
P.S. - With John McCain (age 72) running for the U.S. presidency last year (he would have been the oldest man to assume the presidency), Foreign Policy magazine was cheeky enough to do a list of the World's 10 Oldest Leaders. You can find it here.