When he was 14, he concluded that he needed to learn stuff, actually important stuff. Like electronics, physics, neurology, science, and the future.
And with the help of google and some unorthodox means, he learned lots, more than even most studious adults knew, and with his imaginative, and creative brain, he was going to put his knowledge to use.
He started selling Software and 15 and made a killing.
Learning more and more, while keeping fit as possible in the hopes of surviving long enough to be alive when the world really went nuts.
By 19, he had made a small fortune, and worked on a computer with hardware and software that would cost 10s of thousands to buy it all straight out.
He skipped college in pursuit of actual learning.
By 23, the world had come so far in cybernetics that he actually had his hand literally traded for a cybernetic one with the help of a very advanced team of scientists who he continued to cooperate with for an unspecified period of time that he author can't give for it would spoil lots of the story.
Over the next 20 years, he replaced every lung for cybernetic replacements hat were dozens of time more powerful than that of a natural limb.
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He wore a thick titanium vest over his torso, and a equally strong helmet with telescopic vision, thermal vision, and a UI that could do many many things.
His ribs were replaced with a metal alloy that easily bests anything that exists during the time of writing.
Over time his limbs were improved and replaced many times, and he continued to cooperate with the team of scientists and even had a fair share of stock in them after seeing what they were capable of.
In 2058, a cure or at least a close cure to death by old age was found, we knew how for a long time, we just didn't have the technology to implement it.
Of course he got his hands on it as soon as it was relatively safe and working.
In a war with china, russia, and japan started, he was withing the blast radius of a nuke not even a quarter of the way through the war, his massively improved body allowed him to survive but lots of his flesh had to be replaced, and everything from the hip and below rotted away and had to be replaced, and his status with the scientists came in handy once again.
Now with more cybernetics than that of Darth Vader, he was by every meaning of the word, a cyborg.
In 2075, every country had fallen, and only fragments remained.
2 branches of the american government's more secret organizations survived and he and he scientists were recruited.
After successfully replacing his eyes with something a cross betwern metal and flesh, he was near the peak of what technology was even capable of doing so far.
And the story actually starts here, in what we refer to as the Splinter Wars, were different factions warred with eachother over resources, technology, and land.