There have been some important changes in the population of my country in the last 20 year. For example my country, Thailand has a stable birth rate. Due to it has a policy of contraception that has been effective from the past until the present. Thai working women tend to delay marriage and being single. Moreover, the aging population has changed too. At the end of the year 2018 the number of elderly over 65 years old about 705 million people.Some positive results of these changes include if more aging population, the government should take advantage of this point. Such as creating a new policy that promotes the health of the elderly, because when they can work longer and more power. It means the cost of medical down.On the other hand, there are serious concerns. One is ‘Less population and more elderly people’ cause lower production efficiency which affects the country's growth.