That is awe inspiring!
I agree...its all in your head, so to speak...if you tell yourself that you're old, you'll start to feel old and won't be able to do things...you'll literally age before your time!
I see it with my mom all the time.
Of course some days I feel ancient and I swear my joints and feet belong to those of someone twice my age....and other days, I can keep up with 20 year old!
I'm a nurse in a nursing home, I work with Alzheimer's and dementia patients. Sometimes I come across someone who believes that they are 12 years old and even though their bodies are failing, all skin and bones, arthritis in every joint...during those times they believe that they're young, will stand up and walk unaided...the human mind and soul are amazing!