How many people here would like to live to be at least 80 years old? Yeah. I think we all have this hopeful expectation of living into old age. Let's project out into the future, to your future "you's," and let's imagine that we're all 85. Now, everyone look at two people. One of you probably has Alzheimer's disease.

在座有多少人希望能活到八十岁以上？ 好。 我想我们每个人 都渴望能够长寿。 让我们穿越到未来， 未来的你们 假设都已85岁。 我们随便挑选两个人， 其中一人就可能患有老年痴呆症。