FWIW, I really dislike it when people perpetuate the myth that 50% of marriages end in divorce. We actually have no idea what the true percentage is, and I think they myth got started because people compare the annual marriage rate with the annual divorce rage.
http://en.wikipedia.org/wiki/Divorce_demography
But I was just being illustrative; my point applies even if it's 20% or 80%.
Not necessarily, because people are notoriously bad at evaluating themselves, and often tend to assume that statistics (especially troubling ones) don't apply to them for whatever reason. For the divorce statistic (which I understand is not necessarily accurate, but let's pretend it really is 50%), how many of the divorced couples previously thought the statistic was irrelevant for them, because they're "truly in love" or some other reason?
That's like saying that I should expect to live to 120, because it's been done before. And, I should ignore the expected lifespan number.
Maybe healthy lifestyle choices will increase my lifespan. But, to expect that I should be a statistical outlier seems risky.