Fix any grammar problems in the given text:
Population in the world is aging rapidly and the number of persons aged 60 or over is expected almost to triple, increasing from 737 million in 2009 to 2 billion by 2050 globally.
The population in the world is aging rapidly, and the number of persons aged 60 or over is expected almost to triple, increasing from 737 million in 2009 to 2 billion by 2050 globally.