I suspect you're being downvoted because you're simply wrong as a matter of physics. Your body isn't a closed system. Entropy is a global variable, it's entirely possible to have subparts of a system (often called things like "engines" or "HVAC systems") experience net decrease in measured entropy just by moving energy around. And your body does that every day. The overwhelming majority of all identifiable entropy transfer in an organism happens as part of "metabolism", not "aging".

That the engine doesn't work forever may very well have a thermodynamic expression, but "because of entropy" is basically missing the point.