(UNITED NATIONS) — The world’s population is getting older and growing at a slower pace but is still expected to increase from 7.7 billion currently to 9.7 billion in 2050, the United Nations said Monday.

The U.N. Department of Economic and Social Affairs’ Population Division said in a new report that world population could reach its peak of nearly 11 billion around the end of the century.

But Population Division Director John Wilmoth cautioned that because 2100 is many decades away this outcome “is not certain, and in the end the peak could come earlier or later, at a lower or higher level of total population.”