No process is ever reversible. Sorry. Reversibility is a theoretical ideal to which a few systems tend, which thermodynamicists use to make the physics simpler. Living systems are in general far from reversibility.
Living systems are in general far from reversibility. I gather you don't think anybody would return to their embryonic state and crawl back to where they came from.
I left off an end/sarcasm--but I'm always thrilled when someone has their thinking cap on!