Discover how your mattress can help test your core strength after 60. Core strength is one of the most overlooked markers of healthy aging, and it matters far more than most people realize after 60. Improving your core strength after 60 doesn’t necessarily mean having a toned midsection or trim waistline. Also, core strength is involved from reaching and bending to catching yourself if you stumble. The good news is you don’t need a gym or a yoga mat to put your core strength to the test.