aged population造句怎么写

Comparative study on constitution of the aged population of China and Japan;

Various measures will be adopted in an effort to solve the problems related to the social security and cultural well-being of the aged population.

Prevalence of pterygium in rural Beijing aged population

Epidemiological study of depression in aged population in Shanghai area.

The aspect of payment of the old-aged insurance fund, our country faces the problem of aged population, turning to retire early, changing costs so that it pays the money difficultly gradually.