Jeff Bezos turned 60 yesterday, and a day later — he emerged looking like he’s in his 20s again … at least that’s what his outfit’s screaming here all the way over in Europe.

The Amazon founder/multibillionaire hit the town Saturday in Milan — where he and his fiancée, Lauren Sanchez, are visiting as he celebrates the big 6-0 in style. Emphasis on that last part … ’cause, as you can see here, they left their hotel dressed to the nines.

JB was in an all-black getup … rocking a leather jacket and some nifty shades, while his lady was in a matching black-and-white ensemble. Indeed, they look very power couple-y.

Of course, there were a ton of paps around snapping their exit, and Jeff made sure Lauren got into their waiting car first — ever the gentleman. Gotta say … dude’s a bit of a butterfly.

By that … we mean he’s glowed up quite a bit over the past 2 decades — especially ever since he got with Lauren. Jeff’s in the best shape of his life, and he’s finally dressing like the uber-wealthy tech mogul that he is. This fashionable outfit is Exhibit A on that.

Consider what he looked like when he first started Amazon in the ’90s .. a stark difference.

Now, homeboy’s in his Lex Luthor phase … and he’s definitely living it big as one of the richest men on the planet. Luckily for him, Lauren completely complements that vibe too.

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They’ve been on a nonstop unofficial honeymoon ever since they got together — traveling the world and soaking in vacays everywhere you can imagine. Safe to say, she’s brought him out of his shell a bit … or dare we say, his cocoon!

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Like we said, they’re set to get married in the near future … and we’re sure that era will be loads of fun as well. Happy bday, Mr. B — you sure are a sight to behold at 60.