translation.en: That was easy, but then I made the decision, maybe arbitrary, that they needed to be people of a certain age, which at that point, when I created this program, seemed really old.
translation.zh: 这个很容易，而之后的一个决定， 也许有些武断， 就是受访者应该都到了一定的年纪， 在我立项之初， 就决定被访群体主要是老人。