Don't expect human life expectancy to grow much more, researcher says

FILE - Emma Morano holds a cake with candles marking 117 years on the day of her birthday, Nov. 29, 2016, in Verbania, Italy. A new study says that while the number of centenarians will grow, humans are hitting the upper limit of life expectancy. FILE - Seniors practice tai chi in a cultural center in Brussels, June 28, 2017.

Humanity is hitting the upper limit of life expectancy, according to a new study.