Perhaps it was tongue-in-cheek, but I'm not sure the "leave your marriage" advice has any backing whatsoever; in fact, it would appear to be quite the opposite effect on one's lifespan:
http://news.bbc.co.uk/2/hi/health/4779267.stm
"Those who had been widowed were almost 40% more likely to die, and those who had been divorced or separated were 27% more likely to die. "
Overall, the article felt light on facts - even the title is even fairly linkbaity (live forever!). For an article on increased lifespan (with citations instead of hand-waving), this article is much better: