Unfortunately the definition of maturity that the Academy gives us is falls a little short (not as a flaw of this source, but due to the field of information seeking to deliver, i.e. definitions), referring to the age of a person, as to which it has reached its fullness, but without having reached what is considered as old age. The big problem facing this consideration is that people mature in different ways and at different ages. True maturity has its stages and must also define the types of this. We could say that there is a physical maturity, another emotional and an intellectual. Even when each other are closely linked to and this is a purely formal division, there are very clear differences.
Briefly say that physical maturity is reached to between 21 and 25 years old, when the body has all his faculties at its peak. I have also to point out sexual maturity is reached a bit earlier, as at 12 or 14 years in girls before that children, although optimal for reproduction age is quite backward, although not as much as some specialists say. The emotional and intellectual maturity is closely related to the way that the brain matures at the same time but interestingly have a small problem with this because this is also in how our brain has evolved since the before the prehistory.
You will be asked to imagine a small town in the middle ages: streets of land lots of houses around the military, social, and religious centers. Over time the streets are cobblestone homes improve their building materials, we find more people people grows, and develops for centuries to form a modern city in which we did not find traces of what was the original or primitive people. It is similar with the brain, evolved from the very primitive parts but that never disappeared, as if in our city of the middle ages simply adding houses and new buildings around the old. In the brain, everything new and old work and have its utility. For example the parts having to do with instincts and emotions correspond to the primitive parts of the same and that explains why feelings emerge more rapidly than reasoning.
A person is mature emotionally when you can resolve conflicts that make these to come with little or no intervention from them. For example when a person is a child and falls, most likely is that it gets to cry or has make a tantrum while a mature person can have the same feelings but is unlikely that gets to cry or make the tantrum. It is also clear that many people take advantage of the emotional immaturity of others as in the case of the lawyer who speaks front in a court in a very emotional manner to win the sympathy of the members of the Court.
Very emotional maturity hand the intellectual is characterized because the person makes use of all the "higher" faculties of the brain, what happens is that these powers such as learning, logical and mathematical reasoning do not reach maturity if they are not exercised. That is the reason that the educational system too much emphasis on it, but like everything in life and especially in relation to the maturity can be that someone "mature force" because people must do so on a voluntary basis and many times if they do not have the "need" to do it as do not.
There are many factors involved in both emotional maturity as the intellectual but we can group them between those who are genetic (inherited) and those that are part of the environment (family, community and culture up to to which it belongs) generating a great controversy between those who support the tendency to believe that genetic factors prevail over factors that have to do with the environment and otherwise valid. A trend increasingly supported by studies, that in some people is the environmental genetic and other factors as a result of an interaction that occurs between them unless one actually prevail.
Maturity in samples societies has become increasingly complex because the interaction between members of the society also increased its complexity. By way of example that in antiquity and the middle ages to the age of 15 was considered a young man was ready for marriage and performed a ritual or celebration while today it continues to be a symbolic celebration, even if I can remember my grandmother and my mother married to the 16 or 17 years. Today it is considered that it is not an age suitable for marriage and less to procreation but also found many young girls and young boys being already