6、保持30岁的身体或者30岁的思想，你会如何选择？

6. If you were able to live to the age of 90 and retain either the mind or body of a 30-year-old for the last 60 years of your life, which would you want?
6、如果你能活到90岁，但是在后面的60年里你只能选择保持30岁的身体或者30岁的思想，你会如何选择？