Dr Kirk Parsley joins John to expose the real drivers of aging-related decline and explain why so many men are getting old before their time. From sleep quality and metabolic health to hormones, strength, and recovery, they break down the objective metrics that separate those who thrive from those merely surviving. If you’re serious about building a stronger, healthier, more capable body for decades to come, this conversation delivers the blueprint for longevity, performance, and quality of life after 40.