"With the world's population growing older, there will be a lot more elderly people willing and able to work longer periods in their lives in both developed and emerging economies.ccording to the United Nations (UN) population division, the number of people over 60 years old is projected to grow from under 800 million currently (representing about 11% of the world's population) to over two billion by 2050 (accounting for about 22% of the world's population)." (Quoted from article)