The midlife crisis has a whole new target. Once the bastion of people over 40, the midlife crisis is now affecting people as young as 35, according to researchers from Relate, a British marriage guidance service that interviewed 2,000 people of all ages. Why?

Blame it on work, specifically a shifting corporate office culture where younger people are promoted more quickly. The upshot is that the average age of a chief executive officer is now 48, down from 59 a generation ago.

That means, you had better be halfway to the top office by your mid-30s or you won't ever have a chance for that big job. Working toward this goal in your 30s requires not only a prodigious effort, but also lots of hours in the office -- the exact time in life when many are also dealing with young children at home. In addition to being the loneliest of all age groups, they're the most dissatisfied with their marriage and unhappiest at work.