Welcome aboard! Age isn't a factor that should limit you, with age comes patience that should make up for the fact that it takes a bit longer to train our fingers. I know when I am learning a particularly tough chord change or picking sequence I just work it over and over on the couch, driving the other half bonkers, while we watch a show together, or a good thing to do when watching a game on the tube.
One day you will realize that you have achieved something and that will motivate you to continue. Having bought a quality instrument will really help, as has been said. If you have a cheap guitar and you play it right but it still sounds bad, that can kill your motivation.
Enjoy!