Maturity is not based on age, no matter how old you are if you do not behave well in a sense as mature people do, then maturity is not yet on your side. It takes a lot of time, experiences, and immaturity before we have that deep kind of maturity.
There are a lot of signs to know if we already mature or not, as I've said age has nothing to do with it. There are a lot of people who are old enough and already an adult that are still immature. To know if you already mature here are some keys to determine, how mature you are.
Signs of Maturity
You realize how much you don't know
Accepting or realizing that you don't know everything, there are these instances that we act as if we know everything. Keep bragging here and there, mature people know that the world is so wide, wide enough to be covered all information by our medium-sized brain. If you are already mature you know, you don't know everything, our knowledge is limited so it's good to accept it and learn to appreciate other people's knowledge.
Talk less and listen more.
Immature people like to have arguments, they like to talk more a lot and do not listen because they don't accept that they are wrong. Mature people will listen first before they talk.
You are aware and considerate of others not being self-absorbed, self-centered, and inconsiderate.
Mature people consider other people's opinions or other people's sake and do not act being selfish.
Do not take everything personally, getting offended easily, or need to defend or prove yourself to make excuses.
Mature people have developed sportsmanship or being professional whenever or whatever circles they have they don't get easily offended to other people's mockery. Mature people are in control of their emotions.
You are grateful and gracious, who does complain a lot.
Whatever circumstances you have or any task is given you will never find something to complain about. Some people just find fault in every situation to have complaints, mature people don't do that.
You are responsible for yourself, your happiness, and your health. You do not rely on others to fix you and placing blame on others for your circumstances.
Mature people do not blame other people for their bad situations, instead, they will find solutions to the problems. They are always responsible for themselves.
Having compassion and forgiveness for yourself and others.
Mature people are aware that humans aren't perfect hence they commit mistakes, so they will always have room for forgiveness and compassion for themselves and others.
Stay calm and peaceful. Not being desperate or irrational.
Mature people will stay calm whatever the situation is because they knew panic does not help, instead, it will lead to being desperate and irrational actions.
Being flexible and open. Does not resist, control, and unreasonable.
Mature people are flexible and open-minded, they don't give unreasonable opinions or actions and are not controlling.
Doing things for yourself and not relying on other people for entitlement sense.
Mature people are self-reliant and not a credit grabber, they have a high sense of capabilities that don't need to rely on anyone but themselves alone.
Do good deeds without expecting in return out from your help, being selfless.
Some people do a good deed because they want something in return or they have some bargain, mature people do good deeds by pure intentions without counting and asking any in return.
Respect other's opinions, beliefs, and ways of life without judgment. Not insisting you are always right and belittle other people just to get your points across.
Some people don't know how to respect other people's opinions, they keep insisting that they are right and other opinions are wrong. Mature people do not argue so much and respect others' opinions and beliefs without giving judgment.
Sharing your blessings to others
Immature people only like to receive and do not give, mature people are giver than receiver because they find it very satisfying to share and help other people in some ways.
Not wishing or thinking harm to other
Mature people always look for the common good of the situation and do not think about harming other people for their good.
Think before you act, having good manners, and not being rude.
Immature people are impulsive while mature ones always think before they act, they will picture out first the possibilities before making an action. Not being rude and always have good manners and right conduct.
Supportive and encouraging other people
Mature people will help others to be courageous and support their fellow instead of dragging them down. Some people are pretentious, showing support to others when they face failures but secretly rejoicing, that is purely immaturity, mature people are genuine.
Being happy for others' success, do not criticize or envying them secretly.
Mature people are happy seeing others' success they also feel the satisfaction of that person and will congratulate them instead of envy.
Always consider that there is room for improvement and growth. Reaching out for help if needed.
Mature people know that there is room for improvement that it's okay to fail as long as we don't give up, and not ashamed to seek others' help because they know by themselves they need others to help to learn from it.
Being humble.
Mature people are humble and do not brag here and there especially to the naive ones.
You can recognize which does not work in your life and make an effort to do something different.
Mature people recognize some things that aren't work in their ways instead of doing the same thing they will find other ways and do something different that is essential to their beings.
Favoring long term benefits by passing up instant gratification.
People who are mature enough will favor doing the things who have long term benefits rather than short terms with gratification.
Accepting yourself and liking it without needing someone else to complete you.
Mature people tend to accept themselves for who they are, they will cultivate themselves and does not need anyone just to be complete. They are aware that they should be responsible for themselves and not bother anyone just to complete them.
Choose to do the right thing, standing what is right and fight for it whether for themselves or others. Just and fair.
Mature people will stand for what is right no matter who are they opposing even if it their own family because they honor justice and fairness.
Sacrificing for other sakes without resentment.
People who are mature enough are willing to sacrifice for others' sakes without feeling bad about it. They are selfless.
Not being materialistic and do not brag.
Mature people are not materialistic, they are more practical and do not brag about the things they already have.
All people will have their maturity, not by age, but with the help of experiences in life. Mature people are not toxic and being comfortable with themselves.
I must say, I already mature at some point. I am doing the opposite things I stated above before, now I have seen the difference and realized maturity hits me already. Although I am childish in some ways, my actions and decision towards serious matter can be considered mature, not by the age but by the experiences I've been through.
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I also agree with you that age has nothing to do with maturity. There are many people in their fifties but there is no danger of maturity in them. Again, there are many people who are younger but use their manners, the maturity of the movement is revealed. Whether a person is mature can be understood through his movements, speech, manners, mannerisms, etc. Thank you so much for presenting the details of maturity in so many beautiful ways through your writing.