From the article:
The new study also found that the likelihood of someone dying on their birthday also increased with age, with the probability rising to 18 percent in people over the age of 60...
Researchers also found that, among men, there was a 34.9 percent increase in suicides, a 28.5 percent increase in accidental deaths and 44 percent rise in deaths from falls on birthdays.
Great. Just great. "What do you want for your birthday, honey?" "Oh, just to get through it alive..."