If you’ve ever wondered   why some people stay sharp, energised, and productive deep into their 40s, 50s, and beyond … the answer often comes down to something microscopic but mighty. Your   mitochondria . Mitochondria are tiny “power plants” inside your cells that produce ATP*, the energy currency your body uses for everything from thinking clearly in meetings to recovering from workouts to keeping your immune system switched on. * ATP is Adenosine Triphosphate. It’s often c