When Does Puberty End For Guys? Is It True That Man Boobs Disappear Once Puberty Is Over?

I don’t think I have Gynecomastia, I don’t feel a lump behind my nipples…
I’m 15 years old, and weigh 120 lbs, people say I’m underweight. I think I lost a lot of weight when I was 14-15, used to be a little bit chubby. And i have man boobs.
Will they go away at the end of puberty? When does puberty end?

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