They suit some people. Others not so much. There are some really dire ones out there, mostly the ones that are completely shaved at the sides with a dead stop between the hair up top and the sides. I just think it looks bad but it seems to have mostly fallen out of fashion, most of the man buns you see these days actually look alright if you ask me.
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Anyone that's had the same haircut for 20 years should probably think about changing it just.. because. Live a little. Treat yourself. You might like it.