It's safe to say that the boy band era might be over, but we have some great memories of growing up with *NSYNC and the Backstreet Boys. We loved listening to these pop songs over and over again, memorized the lyrics, and picked out our favorite member.

In 2010, One Direction came on the music scene, and people went pretty crazy. These five young guys -- Liam Payne, Zayn Malik, Harry Styles, Louis Tomlinson, and Niall Horan -- looked great together and sounded even better. We all know the story: the boys auditioned for the reality series X-Factor and then their first album Up All Night was released in 2011.

The boys have all moved on and gone solo, but we can't help but want to look back on their time together. Here are 20 pics of Harry Styles and One Direction's transformation through the years.

22 One Direction Started In 2010 And They Were Just Babies

When One Direction became a boy band in 2010, they really were super young: Rolling Stone says that Harry Styles was only 16 at the time and Louis Tomlinson was 19.

We love this pic of the boys as they look so young, wearing plaid shirts and cardigans and jackets.

21 The Band Was All About A Youthful, Preppy Style

It's so interesting to look back on the way that Harry Styles and One Direction used to dress when they were just getting started as a boy band.

They were definitely preppy, as we can see from this picture. Harry Styles, for instance, is wearing short khaki pants and a turquoise polo shirt and a blazer. It would be impossible to see him wearing this outfit today.

20 They Didn't Look Like A Band So Much As Private School Kids

If we saw this photo and didn't know that it featured the boys of One Direction, it would be super easy to mistake them for private school students. They're dressed in such formal, fitted clothing and they look so young in this picture. They definitely had a prep school style down pat.

19 Harry Was Starting To Grow His Hair Out

Look at baby Harry Styles. He's beginning to embrace the world of long hair, and at this point, his hair was a bit poufy and growing out more to the side than anywhere else.

He looks adorable, though, and they all look like they're enjoying being in a band together (well, except for maybe Zayn on the end, who doesn't look too thrilled).

18 Then They Started Dressing Like Dapper Young Men

All of a sudden, it was like One Direction were dapper young men who knew how to wear a perfect suit and looked so old.

We can't get over how great they look in their suits here, and we love the various shades from maroon to light to dark grey.

17 Their Rock And Roll Image Was Starting To Develop

At the beginning, One Direction had a preppy way of dressing, but that wasn't always the case.

It's clear in this picture that the guys were beginning to have more of a rock and roll image. They're wearing cool t-shirts with graphic designs on them or leather or jean jackets with patches on them. They all look awesome.

16 Back In The Day, Harry And Taylor Swift Were An Item, And He Looked Adorably Young

2012 was the year when Taylor Swift and Harry Styles dated each other, and fans think that it resulted in her song "Style." There were tons of adorable photos of the two of them, like this one that gives us major fall vibes.

It might be Harry's hoodie and jacket combo, but he definitely looks really young here. Harry once spilled about their romance and said, "When I see photos from that day. I think: Relationships are hard, at any age."

15 Harry Was Going For An Older, More Mature Style

When we look at a bunch of photos of One Direction, we can absolutely see Harry's transformation. He was slowly developing his sense of style (no pun intended) and becoming more comfortable with expressing himself through clothing.

He went for a fedora, shirt, and jeans in this photo, and the fact that he left the shirt unbuttoned quite a bit seems to suggest that he was trying out his rocker chic style.

14 The Boys Looked So Adorable On Their 2014 Tour

Saying goodbye to preppy schoolboy outfits, the boys were now dressing in leather jackets and other coats, and they were becoming known for their amazing fashion as much as for their hit singles like "What Makes You Beautiful."

We particularly like Harry's brown jacket. It looks so cozy and really flatters him.

13 One Direction's Sense Of Style Evolved More

When we compare this picture to some earlier ones, we can see a huge change in how the members of One Direction were dressing. Harry Styles was becoming known for wearing his hair really long, and he chose a sophisticated black shirt and pants, completing the outfit with a really cool blazer.

12 In 2015, The Boys Were Wearing Dark Colors And Sophisticated Outfits

If you want to look elegant, you have to wear black. It's basically a rule of fashion and something that people have following for decades.

The boys of One Direction totally started following this style rule and were wearing darker colors here. We think that they look amazing together and so coordinated.

11 They Started To Shed Their Boy Band Image, Getting Ready To Go Solo

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It's always bittersweet and a bit strange for fans when a band starts breaking up and going solo. On the one hand, you really want them to follow their hearts, and you're excited to listen to the new music. But they had something special together and it can be tough to give that up.

As One Direction was about to go to their separate ways, they started looking more fashionable than ever, like in this picture.

9 Their Transformation Was Complete And They Seemed So Sophisticated Now

By the time that One Direction was getting ready to break up, they were really on top of their style game. Judging by this photo alone, we can say that sophistication was what they were going for every time they got dressed for a concert or event. Harry's red suit with flowers on it is too epic for words.

8 The Band Broke Up In 2016, Devastating Fans (But They Look So Cute Here)

We totally have mixed feelings when we see this old picture of One Direction. Sure, we were so sad that they broke up... but we also think that they looked so cute.

You can never go wrong with plaid, but our favorite outfit here has got to be the one that Harry Styles is wearing. His jacket is just too cool.

7 Harry Embraced Long Locks And Patterned Clothing

Now we're starting to see the Harry Styles that we know and love today. He's got gorgeous long hair, cool boots, and he's not afraid of wearing some patterns.

Honestly, we would totally wear this outfit, too, and we think that he looks so chic and so rock and roll.

6 He Was Never Seen Without A Fancy, Elegant Look

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Not many people (whether they were in a boy band once or not) would be comfortable enough in a suit or outfit that had this much pattern. Harry Styles is never scared of making that kind of style choice and we love him for it. The brown and blacks in this outfit really flatter him.

4 Harry Styles Went For It In A Floral Suit In 2017

By 2017, it was super clear that Harry's transformation was complete and he was now favoring bold colors and big patterns and the kinds of outfits that most people only dream of wearing.

We give him props and we love this floral suit perhaps most of all. It's just so pretty.

3 After That, He Was Fully Committed To Interesting Outfits

We're probably never going to see Harry Styles in a boring and plain outfit like a t-shirt and jeans. Sure, he would look amazing in that because he looks amazing in everything, but it's not really the kind of thing that he seems drawn to these days. This plaid suit, on the other hand, seems right up his alley.

2 Harry Styles Looked Epic At The 2019 Met Gala

The Met Gala is dreamy for anyone who loves seeing celebrities in super bold outfits. Sure, sometimes the clothing choices are kind of confusing, but it's still fun to see.

Harry Styles wore this outfit for the 2019 event and it's definitely the kind of thing that fans expect from him now. It's interesting and sophisticated, and he looks elegant.

1 Harry's All About The Bold Colors Now

Finally, we have this bold outfit that Harry Styles chose: bright yellow pants, an even brighter blue shirt, and a grey blazer.

While most people wouldn't be able to pull this off (and most would say that those colors don't work together), this outfit looks pretty epic on Harry Styles, who really looks cool all the time.