To improve ourselves, we need to grow out of our current comfort zone. Yet, we feel uncomfortable with big changes. The solution is to stretch out slightly, let the stretch become the new "normal", and then stretch a little further.
If you have a growth mindset you believe that your basic characteristics are there for you to build upon and that you have the opportunity throughout life to discover your untapped potential. This article discussed the value of developing growth mindset in the second half of life.