South Korea has the Highest Proportion of Senior Citizens

Japan has currently though the highest life expectancy rate at birth for any population ever, with 88.3 years compared to 84.4 years for the population of South Korea.
The ratio of senior citizens compared to the economically active population (age 15-64) in South Korea has increased to 69.4% compared to only 37.3% 20 years ago. However, elderly people generally work longer before they retire. Even though people live longer than ever before in South Korea, the total population continues to decrease due to the low fertility rate and is now 44.6 million.
Argument: According to the Ministry of Health and Welfare in South Korea, and the United Nations, South Korea will have the highest proportion of senior citizens in the world by year 2050.
Questions: How will the society change when the proportion of aging people will increase? What kind of products and services will they be interested in? Sine they in general will be healthier than today, will there be new activities for them?