内容包括：
1）邀请James的爷爷奶奶来中国；
2）介绍中国老人的晚年生活。
注意：1）词数100左右；
2）可以适当增加细节，以使行文连贯。
How is everything going? In your last e-mail, you mentioned that your grandparents are curious about the lifestyle of the senior Chinese. Now I will give you a brief account.
After retirement, keeping a healthy and balanced diet and e
