I recently got a reminder by mail that my annual college class reunion (Go Tufts Jumbos!), is coming up in October. I also just learned there will likely be an uptick of fellow alumni looking for new jobs after they attend. Here's why...

1. Class reunions make people re-think their career situation.

According to a recent Harvard Business review article, new research by CEB, a Washington-based best-practice insight and technology company, looks not just at why employees quit, but when. "We've learned that what really affects people is their sense of how they're doing compared with other people in their peer group, or with where they thought they would be at a certain point in life," says Brian Kropp, who heads CEB's HR practice.

What's one of those times? Right after a school reunion.

Makes sense really. Meeting up with your school chums and finding out who's doing better than you could be the push you need to find a new job. In fact, the study shows the increase can be as much as 16 percent. But, that's not the only time you may find yourself re-evaluating your career choices.

2. Birthdays make people reflect, too.

The same study shows the decision to look for a new job increases as much as 12 percent when your birthdays approaches. Getting a year older makes a person realize time is slipping away. Your chance at finding greater career satisfaction is diminishing. Why spend another year stuck in that dead-end job?

3. Finally, there's that work anniversary to consider.

When you hit that work anniversary, you're 6 percent more likely to look for a new job as well. It jumps to 9 percent if it's the anniversary of a job you moved over to within your employer. Gone are the days where you work for a company for your entire career. Now, every job is temporary and we're all businesses-of-one who need to look out for our own professional best interests. Making sure your career is going in the right direction is one of the ways you can feel more confident and secure about your future. It makes sense people review achievement milestones on an annual basis and choose to look for a new job if the ROI wasn't what they hoped for.

Deciding cs. doing: Why most job seekers fail

Even though this study indicates people will decide to look for new jobs based on life events, it doesn't mean they'll actually get a new job. That's because there's a big difference between "deciding" and "doing." Job search today requires a strategy, effort, and commitment. Plus, people don't find it especially fun, often choosing to procrastinate by attempting to justify the need to put off the search.

Thus, while these experiences may get you thinking about a new gig, you probably won't kick your job search in high gear. Without some serious internal motivation, these life events alone won't do the trick.