What do you call it when an adult/teenager has child-like behavior?
What is that disorder or medical condition called?
Is there even a name for it?
Yep, the other answerers have it right. It’s just immaturity. It can come from many different things, maybe a parent is the same way. Maybe they had too many childish influences as they grew up…no one mature around them that they idolized.


idk maybe bipolar but id call it immarturity if it doesnt happen often
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Is it necessary to call it a disorder or a medical condition. Isn’t the definition ‘Childish’ good enough?
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A juvenile between the onset of puberty and maturity
Displaying or suggesting a lack of maturity
In the state of development between puberty and maturity
For this condition named as adolescence
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Yep, the other answerers have it right. It’s just immaturity. It can come from many different things, maybe a parent is the same way. Maybe they had too many childish influences as they grew up…no one mature around them that they idolized.
References :