Is he a bit stuck in this teenage behaviour?

My brother is 24 years old. He is no longer a teenager. But he's on his phone 0-24 chatting. Constantly with someone. When he's traveling, eating, working, exercising, he's always doing that. I told him that's not good. He's missing out on life and it's damaging to him to be online so much.

Is he a bit stuck in this teenage behaviour?
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