My iphone won't sync with my itunes?

I updated my iphone to the new ios 7 but it now won't sync with my itunes as it is too old. I can't update my itunes as my operating system on my mac is too old (10.5.8) What do I need to do to be able to update my itunes and then sync my iphone? (except buying a new computer as I really can't afford that at the moment) Thanks!

Well. I'm no mac user. But I would say update the OS and then Update itunes.

The REAL problem is you never bothered to update your OS X from Leopard (10.5) to Snow Leopard (10.6, for $ 29). Snow Leopard includes the free Mac App Store, needed to Upgrade from Snow Leopard to Lion, or Mountain Lion.

So, look on Apple's website in Support, to see if there's a way to Reset your Phone to replace iOS 7 with iOS 6.

Still stuck? Take the iPhone to the nearest Apple Store, or the store where you bought it, and maybe they can roll back iOS 7 for you.