Whoever wants to live a healthier, happier and longer life must perforce have a positive mentality.
As a state of mind, 'a positive mentality' is actually a composite of basic attitudes, which mainly include the attitudes towards what we are facing in the moment, who and what we ourselves have been up to now, and what we expect in the future. Apparently, if we can at least most of the time see and treat with a positive attitude what is happening to us at the moment, we will become attained yangsheng practitioners and thus live a more enjoyable life.
Some people may have been 'born' with a positive mentality; others can certainly learn and develop it in a self-conscious way. No matter what, a positive mentality has nothing to do with who you are, what you do, where you live or how rich/poor you have been.