It is the willingness to pass up immediate pleasure in favor of a long-term gain. Maturity is perseverance, the ability to sweat out a project or a situation in spite of heavy opposition and discouraging setbacks. Maturity is the capacity to face unpleasantness, frustration, discomfort and defeat without complaint or collapse. Maturity is the ability to make a decision and stand by it. The immature spend their lives exploring endless possibilities and then do nothing.
Maturity means dependability, keeping one's word and coming through in a crisis.
The immature are masters of the alibi. They are confused and conflicted. Their lives are a maze of broken promises, former friends, unfinished business and good intentions which somehow never materialize. The really good thing about maturity is it's not set in stone. We have each and every day to improve upon those things we feel we are lacking.