Yes, the bigger issue is under population for most developed nations.
The replacement birth rate (to just keep population stable), is 2.1 live births per woman. The U.S. at 2.05 is slightly under that rate due to immigrants. Our neighbor to the north is 1.58, a sign of serious trouble.
Japan is at 1.2 - which is a death spiral, literally for the country.
Much of Europe is below the replacement rate as well - which makes the Muslim immigrant problem worse. The immigrants are far more fertile, not assimilating, and intent on "reforming" those countries toward Sharia Law.
https://www.cia.gov/library/publications/the-world-factbook/rankorder/2127rank.html
I do believe Russia is at 0.9!!!
Russia 140,041,247 and growing.
I heard on the news that they have the lowest furtility rate in the world. That in 2000 they had 147 mil.