If I buy iPhone 5 now, can I install ios7 later?

DON'T TELL ME I SHOULDN'T INSTALL IOS7. I LIKE IT OKAY.

If I buy iPhone 5 now, can I install ios7 later or should I wait till I buy an iPhone that already has ios7 installed. (I already know ios 7 is coming out in the fall which is why i'm asking)

Yes if you buy it now, you'll be able to to download IOS7 onto it.

Yes you can download iOS 7 later with iPhone 5

Eventually later this year Apple will make iOS 7 available as an upgrade to all existing iPhone 5's, for free (and new iPhone 5's will start coming with it already on them). That's what they've done with every new version of iOS in the past for their latest iPhone. The only way you wouldn't get it (maybe) is if you had a much older model iPhone.

P.S. Since you don't want to install it now (which is smart), there's no reason to tell you not to install it.

Of course.