According to [a recent] report on the aging of the world’s population published by the United Nations, there will be 31 countries where the average life expectancy of the population will be 80 years by 2020. In the near future, the era of 100 years as the average life expectancy will arrive.
The problem is that regardless of the increase in people’s life expectancy, those who live long in good health are rare. According to statistical data presented by the International Association on Study of Pain (IASP), one out of every five people in the world is suffering from intermediate to severe chronic pain, while one out of every three patients suffering chronic pain has difficulty in maintaining an independent lifestyle.