Change — and not that jingle jangle left in your pants pockets or at the bottom of your purse — is one of the constant expressions of life that we depend on, but often a curse as well. But adapting to change — the pleasant surprises and the unwanted challenges — is a key to aging well. If you haven’t yet encountered any of those curve balls thrown your way, you are fortunate. But in the years ahead, it’s almost guaranteed you’ll encounter something that will test your resilience and perseverance.