translation.en: If the average age of your population is 30, then the average kind of disease that you have to treat is maybe a broken ankle every now and again, maybe a little bit of asthma.
translation.zh: 如果人口的平均年龄是30岁的话， 那么需要治疗的一般疾病 可能只是偶尔的崴脚 也许加上点哮喘。