My dad started at age 57. Its never too late.
Totally agree with Max about the choice of instrument. Don't scrimp on your first guitar. Buy the best quality one you can afford. Buy a used one from some other late starter that gave up!! A crap guitar that sounds bad anyway will sound worse in the hands of a beginner. You'll sound better on a better gtr even in the beginning.
Also, embrace the suckage that you will experience early on. Power through it knowing that its a numbers game in terms of hours of practice.
Also, re: Max's comment about the metronome, play your exercises and songs etc, as slow as you need to to play in time. Like stupid slow. The conscious mind (which is the state you'll be in when playing at this point) is about 3 times slower than the subconscious. Expect to knock those tempos waay down in the beginning. But its worth it. In a few years if you can play simple tasty stuff with awesome time and excellent tone you're way better off than if you can shred but are at all sloppy.
Best of luck with it.
