Thought Experiment on Sarcopenia / would once a month training make a difference?

Living Stronger Longer (Your Best Life After 40)

My thoughts on the following:
1. The value of proper exercise on slowing down, stopping or reversing sarcopenia which has profound effects on quality of life (possibly longevity) and health care costs.
2. What the rate at which sarcopenia is thought to occur might tell us about how long it takes to "detrain" if we miss workouts
3. Based on #2, how even very infrequent exercise (signficantly more infrequent than what is needed for proper recovery) can still make a phenomenal difference compared to being sedentary.
Link to youtube version to see screen sharing: https://youtu.be/VkZ__yRsyxs