How to change a life? I am empty nester and single

Serenity starts in. It is not situations that creates happiness. It is our inner serenity. The great thing about human beings are our ability to create what we want and the choices we make - that creates happiness. Visualize what you want and make time for these.
Get involved! Eat healthy, stay active, and enjoy life! Put yourself out there and spend time re-connecting with old friends, co-workers, family. Get involved in community groups such as your local church, elk's lodge, or volunteer at the homeless shelter/hospital/elementary school. Change comes gradually, so remember to take it one day at a time. Share your wisdom!