Aging is a bipartisan phenomenon – although it may strike presidents with even more force than it does the rest of us. President Barack Obama turns 49 today, and after 18 difficult months in office, the evidence is indisputable (although, even in the throes of the 2008 presidential campaign.  The president himself has joked of late about his graying hair and slowing metabolism.

"I can't imagine that the weight of the job doesn't take a toll physically and mentally on anybody that does it," "He knew what he was getting himself into in deciding several years ago to undertake this."

Hillary Clinton became the symbol of long-suffering married women everywhere when she famously stood by her man twice. But these days when a woman feels dissatisfied in her relationship, she doesn't just suck it up and complain to her friends over cosmopolitans. She gets a private email account, posts a profile at LonelyCheatingWives.com and starts looking for hookups herself. In other words, the stigma is gone. In the old days, the news that a woman supped at another man's table might have provoked scandal; now it barely raises an eyebrow. And if she's someone famous, well, that's just a boon to tabloid circulation'

'Affairs are not uncommon,' says clinical psychologist Nancy O'Reilly (aka Dr. Nancy). 'Women tend to keep these things to themselves, but there are signs that they're catching up with the guys.'

Accurate stats on women's infidelity are understandably hard to come by since ' no surprise here ' ladies aren't always keen on 'fessing up to their extracurricular activities. But it's generally guesstimated that 14%-40% of married women have intimately tangoed with someone other than their husbands.