You may have read the great Job's "Stay Foolish Stay Hungry" speech at Standford. I think this Chinese speech is also very inspiring: to ourselves, and maybe to our children.
Everyone has his/her dreams when he/she was young. Do you still remember your dreams? Have you achieved your dreams? Keep pursuing them. The least we can all do is to live well and try to be the last 80 years old one to send off the others for life