My first idea.
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Sargeant.
Age: 26
Birthday: January 5th, 1995.
Born: undiscovered location located near Himalayan mountains.

In 1976, there were two people who were unknowingly living in a cabin they built up at the Himalayan mountains.
These people had a criminal record within the past, and had gone to jail several times. They were known very well for their past, and wanted to escape to a new life.
So they left America, and made their way to Asia.
With little to no supplies, they had to live as if it were the stone age.
For many years, they made their own tools, hunted their own food, chopped down trees, and made structures in order to survive. They as well have also made their own clothes. They had to learn to do these things unfortunately, as they had never learned to do these in their own lifetimes.

Eventually when they had settled, they had decided it was time to start really living.
In 1990, they had tried several times for children. But for several years nothing came up. Until May 1994. They had tried, and the female had visibly become pregnant. In January 1995, during winter. They had their own child. They named him Tescter Sargeant Miller. Escaping their past, they completely disbanded their own family last names, and started a new family.
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Give me some time to think >:(((((