Very interesting and truly brilliant post. As I understand aging is definitely an irreversible process, but certain good health practices can definitely delay it to keep one healthy, but for a finite amount of time. Growing old and then being chucked out of the ecosystem is the vital part of the system to keep it going on and on, without getting way too crowded, by whatever ways, means and methods. Nature's strategy is very well known to the humans, still they try to undermine it and playing with God to become immortal. Impossible.
The essence is as you rightly stated, "it is more important to live a peaceful, happy and healthy life."~