Researchers studying adult life expectancy in Austria and Denmark found a troubling correlation between spring births and overall lifespan. Namely, adults 50 and older who were born in the spring died approximately six months sooner than others. While that sounds scary, there is good news. The same researchers also looked into the mortality rate of infants, expecting to see similar results, but didn't. Environmental factors in utero and early childhood likely contribute to overall lifespan, not just when we're born.