It varies but I would say typically around 25. Years 18-24 are still mostly spent coming to terms with adult responsibilities and unlearning oversimplified teenager worldviews.

Life altering events or lack of can influence this one way or the other. Like moving out, starting a relationship, having children or loss of someone close. (Literally anything that makes one re-evaluate ones values and thinking)

Like someone living with their spouse and 2 children at age of 25 will likely act more mature than say socially isolated NEET still living at their parents at age 30. (Not trying to shame with the latter, just pointing out how life experience outweighs age in this)

Maybe Jolla phone? Dont know if its good enough for daily driving but seems like it has some potential.