Amusingly*, when I was walking to the car this afternoon, two girls stepped out in front of me, both with their hair in buns.
*For very generous definitions of the word
I put my hair up almost every day. It’s a lot longer than I like it right now (getting ready to chop it off and donate it) and it gets in my way all the time if it’s not up. So I twist it up and use hair sticks to hold it in place.
Yeah that top knot bun look is very popular now with the young set.
A friend, that I knew for 7 years, always wore a bun. I never saw her without it.
She used one of these things.
I’m active duty military…I wear a bun every day, and so does every woman I work with who has hair past their collar. I also have very long hair, and the invariable reaction when my co-workers see me with my hair down is “Wow, I didn’t know your hair was so long!” Yeah, well you wouldn’t, would you. Sigh.
I usually yank my hair into a half-assed bun while I’m at work to get it out of my way. Nothing as big or fancy as the sock bun things, just twirl the hair up so it coils on itself and then wrap an elastic around the ball.
I don’t usually do that as a “hairstyle”, though. If I’m trying to look good I’ll clip it up in a twist.
My wife wears her hair up in a bun like 99% of the time. When she wears it down, she usually wears it in a braid that drags on the floor. I think she wears it up so I won’t step on it. 
I’ve only done a bun a few times. My go-to updo is a sort of half french twist clipped diagonally with one of these or a large barrette, and the ends left out in a spray kind of like a rooster tail. I can’t find a picture.
I wear my hair up most of the time. Mostly I do a ponytail or a bun but sometimes I braid it. In college a bun with hairsticks was my standard hairstyle but right now my hair isn’t quite long enough to be held firmly with sticks.
This. It’s how I spent the day at the office yesterday. And lots of other days, too.
Back in the early 90s, I used a scrunchy instead of a regular elastic ponytail holder.
As did we all. I have conflicting feelings about memories of my pink zebra print scrunchie…
On days when I don’t feel like doing anything with my hair, I either do the same kind of bun that **Antigen **describes or I put my hair into a ponytail but only pull the hair half way through on the last loop. I don’t think that’s really considered a bun, but it’s not a ponytail either. Hmmm.
I should say that my hair is naturally curly/frizzy/crazy, so making it look nice takes time. Sometimes I just don’t feel like it! 
Did “star Wars” inspire a bun popularity? Princess Leia wore one, as I recall. Of course, she looked better as Jabba the Hut’s slave.
Gotta lot of family members that belong to a conservative Christian church. Women aren’t allowed to cut their hair (or wear makeup or …). Girls can wear their hair down but married women are expected to wear buns.
So, yeah. I know women who wear buns. Hardly a big deal.
Black with white polka dots here. 
When my hair was long, blond, and streaked, I would sometimes make a tight braid and wind it around into a bun, secured with countless bobby pins. It was the color of butter n’ sugar corn, yellow and white, so pretty! (but I didn’t like wearing my hair that way, I was sort of afraid to move my head and disturb the not too secure bun.) For my daughter’s dance class, the instructor said all long hairs must have buns. Daughter had long, very silky slippery hair and try as I might, it kept coming loose. I was about to buy some sort of hair glue you’d make a mohawk with when I spotted an invisible hairnet in the hair accessory section. That did the job just fine, covered up the hair knot and held it tight, stuck in a thousand bobby pins, sprayed with Aqua Net - success!
I wear buns all the time for curling purposes. When I want extra curl, I pre-braid the hair. When I come home and unfurl it, the hair has beautiful, thick waves to it.
It’s to my waist, so my bun is always rather large. Sometimes it becomes too heavy, particularly if I wound it too tightly.
I see a lot of buns around here in Indiana. Sock buns, high buns, low buns, twin buns, messy buns (the most popular).
I don’t think it looks matronly at all, particularly if you have bangs. Yes, I’m 34 and I have bangs.
I don’t know. If you have very long hair, the bun seems to be a staple. Same with twin braids. I wear and see those a lot, too.
Thanks for all the replies (well apart from the ones that are trying to be aggressive/ superior).
I didn’t realise that there were still a lot being worn.
Yesterday I was in a place where I saw a lot of these: an airport. I saw them on flight company female personnel (both on-land and in-flight).
Talk about old-fashioned…