Car companies have decided to be 25, as in many states you can't rent a car if you are under 25.
Turo, has the age limit at 30 for high-value cars.
You have to be 35 to run for president in many countries....
etc...
There is obviously a sliding scale, but the 25-ish age range is more physical where your prefrontal cortex is still developing, while later stages are more experience based maturity.
"Neuroscience has shown that a young person's cognitive development continues into this later stage and that their emotional maturity, self-image and judgement will be affected until the prefrontal cortex of the brain has fully developed.
Alongside brain development, hormonal activity is also continuing well into the early twenties says Antrobus.
"A number of children and young people I encounter between the age of 16 and 18, the flurry of hormonal activity in them is so great that to imagine that's going to settle down by the time they get to 18 really is a misconception," says Antrobus."