Tech CEOs used to be infamous for their lack of style.

But a photo revealing how much Amazon CEO Jeff Bezos has changed over the years shows that the stereotype is changing. 

Here are 12 photos that prove how time and success changed some of tech's most famous CEOs. 

Back in 2005 when Amazon was just selling books, Jeff Bezos would frequently wear sweaters over collared shirts.

2005 Ted S. Warren/AP

Today, Bezos' appearance has noticeably changed — his shaved head and toned arms recently sparked a meme on Twitter.

Drew Angerer/Getty Images

Source: Business Insider

Two of PayPal's founding members, Peter Thiel and Elon Musk, dressed much more casual back in 2000.

Peter Thiel and Elon Musk, 2000 Paul Sakuma/AP

Today, as the CEO of Tesla Motors, Musk has sharpened up his look.

Musk at the Vanity Fair Oscar Party in 2017. Evan Agostini Invision/AP

Peter Thiel has also remained in the spotlight — and changed his style — as a Silicon Valley venture capitalist.

Alex Wong/Getty Images

Google cofounders Larry Page and Sergey Brin probably wouldn't be caught in matching green pants today.

Google's co-founders rest on bean bags at Google's headquarters in 2000. Randi Lynn Beach/AP

Today, Alphabet CEO Larry Page has embraced his grey hair.

Larry Page speaks at the Fortune Global Forum in San Francisco, 2015. Jeff Chiu/AP

Sergey Brin has kept his style casual, but he sports a beard now.

Brin at the World Economic Forum in Davos, Switzerland, 2017. Ruben Sprich/Reuters

Twitter and Square CEO Jack Dorsey has been dubbed as one of the most stylish guys in tech. He hasn't hidden his love for Prada suits and Rolex watches — but even his style has evolved.

Jack Dorsey of Twitter, 2010 Chip East/Reuters

Source: GQ.com

Most notably, his beard and jeans add up to a modern, refined style.

Jack Dorsey, 2015 Mike Blake/Reuters

In 2007, Facebook's Mark Zuckerberg dared to wear sandals while speaking at the Web 2.0 summit in San Francisco. In 2012, he received criticism from Wall Street for wearing his signature hoodie to an IPO meeting.

Kimberly White/Reuters

While he cleans up a bit more for big events today, Zuckerberg has spoken out on his grey t-shirt uniform, telling an audience at a public Q&A: "I really want to clear my life to make it so that I have to make as few decisions as possible about anything except how to best serve this community."

Zuckerberg during the annual Asia Pacific Economic Cooperation forum in Lima, Peru, 2016. Esteban Felix/AP

Source: Business Insider

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