Joan says that a 70-year-old can decide to feel young and act young,but "if you're 50 and you think you're old,you're old." Bill says,"I'm 71 years old but I don't feel 71 years old." Which concept,mentioned by both of them separately in this video,seems to be a basis for these philosophies?

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11ea904d_5708_8968_aec7_6d7e77bbfeff_TB1425_00 11ea904d_5708_8969_aec7_b52bd7b6b7e0_TB1425_00 .

Joan Says That a 70-Year-Old Can Decide to Feel Young