Uhm ... could you define older? :-)
Sure you are older then some pople and older than you were yesterday, but so what? You are only too old to take up anything when you yourself begin to believe it. When we set your mind to it, we can achieve almost anything.
Learning guitar is not rocket science you know. There's a learning curve for sure - just like anything else wort keeping.
Get yourself a decent guitar (properly set up), have some instruction (on-line or off-line) and get cracking! Half an hour of proper training every day will works miracles :-)
Best of luck to you from another "oldie"!
Guitar Questions And Answers