Climbing stairs is a natural stress test for the heart and lungs.
Experts say that if someone can ascend a full flight without chest tightness or excessive panting, their cardiovascular reserve is still strong — a critical factor in living to 90 and beyond.
5. Maintain Stable Body Weight and Good Appetite
Unexplained weight loss at an older age is often a warning sign of underlying illness.
Conversely, older adults who still:
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Eat well
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Digest normally
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Maintain healthy weight