Why do I have childish behaviors?

Assertiveness helps. Everyone has room for growth. If people fall back on childish behaviors that are ineffective they may be lacking coping resources (skills) that would be more effective in meeting their needs. Learning more effective alternatives to childish behavior would yield improved results. Increased assertiveness, in particular can help tremendously in allowing people to better stand up for themselves.

Related Questions

Why do I have these childish behaviors at 90?

You choose. Starting point: what are you calling childish, what about it bothers you? Where do you do it? When? How does it serve you? Next point: what do you want from yourself instead, why do you want it? Next point: mentally rehearse new behaviors in the presence of old triggers until they become familiar to you. Your behavior isn't happening to you, but through you. Identify and choose new behaviors. Read more...
Kudos to you. As long as your behaviors do not cause harm to yourself or others, i think you should keep right on being young at heart.I bet you're a fun grandparent / great-grandparent! Read more...