Thanks to the development of new medical technologies and improvement in medical care the last decades are characterized by the growth of elderly＇s number. The median age of the world＇s population is increasing beca...Thanks to the development of new medical technologies and improvement in medical care the last decades are characterized by the growth of elderly＇s number. The median age of the world＇s population is increasing because of a decline in birth rates and a 20-year increase in the average life span during the second half of the 20th century.展开更多
文摘Thanks to the development of new medical technologies and improvement in medical care the last decades are characterized by the growth of elderly＇s number. The median age of the world＇s population is increasing because of a decline in birth rates and a 20-year increase in the average life span during the second half of the 20th century.
