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Do you think we have the least entropy when we are born, or when we're at peak physical and mental performance, like mid 20's to mid 30's?

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The question seems poorly worded but I’ll do my best guess here.

As long as you are gaining weight/height, you should be decreasing the entropy of the system around you. Your body’s entropy should be increasing in absolute terms but staying the same/decreasing as a percentage of your overall body.

Growth without order is cancer. It's a form of entropy, not extropy. Extropy is measured as the increasing signal to noise ratio in a system, not how much space it occupies. The systems least prone to entropy are often the most compact. This is also why it's astonishing that elephants defy entropy by not getting cancer at the same rate per cell as smaller mammals.

Most human beings don’t experience growth in childhood as cancer.

Most growth in childhood is making order out of chaos and reducing noise, so it's extropic. The point was that continued growth is not always a sign of reduced entropy.

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