Per your description and my understanding, it seems a different mechanism is engaged in early life to compensate for necessary growth which I assume leaves quickly once optimal growth is achieved. Therefore I must stand on my original post.
But then isn't this 'different mechanism' part of the organism? So if it is part of the organism and it is allowing it to grow (ie doing the literal opposite of dying) then you can't say its dying.
Its still subject to the forces of decay (entropy & 2nd law of thermodynamics) but this 'different mechanism' allows it to overcome that law and grow and develop (the literal opposite of dying).
Its like saying that a planes wings aren't really part of the plane but an artificial mechanism to allow to to climb and stay up. The 'real' airplane (aeroplane?) is just the fuselage and it will fall as soon as the wings fall off!
You original post said
"Of course, we all start dying from the moment we’re born."
Well you realize that there is nothing special about being born? Its just the process of leaving the mothers body because
1) the baby is too big to remain
2) It needs to undergo developmental processes that have to occur as it lives in the world
So the development that began at conception continues
uninterrupted until about early to mid 20's.
During that time the organism (person) is literally doing the opposite of dying, ie they are growing and developing.
After that, because genetics has determined that we are now old enough to reproduce and live long enough to bring the next generation to adulthood then those repair mechanism (which are as much a part of us as any of your cellular/biological mechanisms) start becoming less effective, now we do start decaying or dying. In other words our repair machinery is designed to last for 25 years or so in optimum condition, after that its out of warranty.
Here's a couple of analogies
Cannon ball in cannon
The cannon ball sitting in the cannon feels the force of gravity but when the cannon fires so much force is imparted to the cannon ball that it climbs, even accelerates, all the while under the force of gravity. It completely overcomes gravity by using the energy imparted to it.
So the ball climbs, ie the literal opposite of falling. The ball can not be climbing & falling at the same time, it is either climbing or it is falling. When the initial energy has got it a high as it can go then the ball starts falling (the literal opposite of climbing).
So gravity = force of decay (or 2nd law of thermodynamics etc)
falling = dying
climbing = growing
climbing does not equal falling
Plane flying
Rather than one big shot of energy at the start, the plane applies energy for its whole voyage. At first it applies enough energy so that it climbs into the air (literal opposite of falling and can't be climbing and falling at the same time). Once it reaches its cruising altitude it reduces the amount of energy its expending to keep it aloft but eventually as it has a limited supply it must at some point yield to gravity and come back down, in a controlled manner in the case of an airplane.
We are like a mix of both, our initial cells are so good that they propel us to adulthood in 20 something years, ie they allow us to defy dying & we develop & grow. So for the 1st part of our lives we are in the climbing phase, to use the analogies, the exact opposite of falling.
Thereafter we begin a slow glide back to earth with the force/law of decay having more & more effect.
Now occasionally a plane may malfunction shortly after takeoff while climbing with the result that it crashes. In that case it no longer flies or climbs but yields to gravity and falls.
So too occasionally an unlucky child will experience a malfunction (disease, injury etc) that will cause their growth trajectory to be affected or stopped so that they then start dying.
But just like most airplanes climb all the way up, so most people grow all the way up before the dying starts.
