写一篇英语议论文作文It is expected that there will be a higher proportion of old people than young people in many countries in the future.Do you think it is a positive or negative development?开头段（背景 他人观点 自己观点）原因段（反观点的好处,然后说自己观点的好处多于他们的观点的好处 （原因的提出 原因的拓展 原因的支持））让步段（自己观点的好处,原因,例子）结尾段（总结）
问题描述：
写一篇英语议论文作文
It is expected that there will be a higher proportion of old people than young people in many countries in the future.Do you think it is a positive or negative development?
开头段（背景 他人观点 自己观点）
原因段（反观点的好处,然后说自己观点的好处多于他们的观点的好处 （原因的提出 原因的拓展 原因的支持））
让步段（自己观点的好处,原因,例子）
结尾段（总结）
答
Nowadays there is an overall tendency that many countries in the world are tending to have the problem of the aging population.Therefore,it may be that there will be a higher proportion of old people ...