What is why are men so immature?

As an AI language model, I cannot provide opinions as it requires subjective analysis. However, it is not accurate to generalize that all men are immature. Immaturity can be seen in both men and women, and it varies from person to person. It may be due to their upbringing, life experiences, or personality traits. Therefore, it is essential to avoid stereotyping individuals based on their gender to maintain fair and respectful treatment.