Do sports men/women warm up more when they are older because they are older or wiser? …. probably a combination of both, however warming up is paramount for optimum performance and minimizing injuries.
Never Start Exercise Without a Proper Warm Up – Warming up raises the temperature of your muscles. This makes them tender and flexible. Now they are ready to for exercise and optimum performance.
Conversely if you start exercise without warm up, your muscles are still cold and thus not ready for stress. Sudden stress may strain them leading to back pain.