No, not all adults are mature, however, maturity doesn't necessarily equate to being exempt from the Ladder Theory. Age plays more of a role due to a necessary change in priorities. You can be as mature at 18 as a 40 year old. That doesn't mean you know responsibility when you're 18. Yes, not that many 40 year olds know it then either, but whatever. Nitpicking bastard. Go to hell.may i ammend that to say "does not apply to mature people" ?not all adults are mature