Which country has the highest black bar?
Singapore.
In a simple plurality voting system, whichever candidate has the most votes wins. This differs from a majority voting system, as a majority voting system requires a candidate to garner over 50% of the vote to be declared the winner.
I believe the answer is: cancer
According to research, about 60% of people who developed cancer got in when they hit the age of 60 or above.
The destruction of cells that happen in older people's body happen on a much higher rate compared to younger people but the regeneration is much slower. This plays a role in speeding up the growth of cancer.