Can temperament change with age? (Choleric - melancholic)

Can't. And do not listen to those who argue in the style of "Well, I cried all the time at school, but grew up and became sociable - it means I was a melancholic, but became a sanguine, gee-gee." Often people do not understand what temperament is, thinking that it is a set of behavioral traits. In fact, temperament is an innate structure of the nervous system, and it is reflected more complexly than is commonly believed at the philistine level.

For example, a melancholic's nervous system is less mobile and inhibition processes prevail over arousal (in everyday language - a person it takes a long break after emotional events). The nervous system is inactive and poorly balanced (a person cannot calm down for a long time and tune in a different way). The sensitivity of the nervous system is higher than that of other temperaments (a person feels his condition better, notices more). So, these properties of the nervous system do NOT change over time and do NOT depend on upbringing, education, social status. If a person "was withdrawn, and then became sociable" or "was cheerful, but somehow became depressed", etc., this does not mean that his temperament has changed. Behavioral patterns and temperament are two different things.

No. More precisely, it changes extremely insignificantly and only in the direction of the neighboring, usually braking type. It can change significantly and noticeably in cases of injuries and diseases of the central nervous system, and even then not in every and even not in most cases.

I am a living example of such drastic changes, I was a phlegmatic until the age of 14, from 14 to 20 sanguine, from 20 to 25 a melancholic phlegmatic, from 25 to 27 now I am a choleric sanguine, and the changes are very serious and strong, I have emotions indeed, they have become completely different, before I did not react so sharply to aggression, but now I am like a real choleric.

He cannot change sharply from one to another, from a hardened choleric you cannot become a hardened sanguine.
First, there are no clean ones, and there are different manifestations.
Secondly, for some reason, there is an opinion that some temperament is cool, while others are all negative and unhappy, this is all nonsense and stereotypes.
Thirdly, changes are possible but not like change, again each has its own joys and difficulties , you can work on dulling pronounced features, for example, I'm a melancholic really not very introverted.

I used to really care that I couldn't take and do the work quickly, like other colleagues "why invent something, did and free, and when there are problems, then we will sort it out. "

After a while, I tried on and at work I say what I do, or to the point where it’s not to dig, longer than others, more expensive, but better, and if the very fact of implementation is important (there are many such projects ) then it is better not to approach me, I will burn everyone's brain.

As well as working with a group (to conduct group trainings), I am a large group, I know how to work, but I am not comfortable and even with the appearance of a skill I still feel squeezed, but with a small group, about 5-7 people, everything is fine with me.

You need to understand yourself, we are all different, the main thing is not trying to go against yourself and build something out of yourself that is not natural to yourself.

as far as I heard, temperament does not change (like something given to us at the genetic level, from birth), but character traits, worldview, and so on, quite.

Of course, a person changes. This does not have to happen, but in our time it is very likely, because the amount of stress and other things just pounced on in large quantities. I will not build any conspiracy theories here, but it looks as if it is beneficial for someone that people turn into melancholic. There is just a big popularization and imposition of everything that was previously considered not entirely normal, and therefore many people are changing. And many generally cut out = \. I know that the last phrase sounded a little immoral, but in fact it is true for the last 5 years, probably. I have not seen any statistics, but before this period I had not heard of such numbers of suicides. We can say that they were not just told to everyone, etc., but on the other hand, I heard about any other cases, but this is more like a new trend.

And in general the phrase that I have known since childhood says: a person changes or dies.