sign of being a mature person

For me being a mature person means being responsible for all your actions and decisions. Because if you can take the responsibility even for bad things without burdening others it means that you're mature.

If you see no evidence of emotional and ethical maturity, the person you are dealing with is not a mature person, o matter what this person looks like. Persons behavior is controlled by selfishness and whims. Don't expect adult understandings or behavior and don't be too upset when this person has a temper tantrum and blames you for something. Immature people's self centered assures us that their blame comes from something internal to them.

Yes I am agreeing wit you because a mature person have many types of abilities to perform anything in their life. I think they have well understanding and also they know well that what to do which is really good for them. And also a mature person always handles any situation with good understanding.