Childhood Trauma

Traumatic experiences can make the body and brain age faster. Stress leads to higher cortisol which leads to physical aging. This process is so strong that children who experience high levels of stress like violence or trauma in infanthood/early childhood statistically start puberty earlier than their non-traumatized counterparts.

One theory posits that early puberty/aging allows for increased survival in traumatic environments. It grants not just sexual maturity but increased bone density, muscle mass, etc. which basically allows you to become an adult faster to survive.