Hello Old, I'm from England and I'm nearly 50 years young too!   

Also had the urge last year and I'm so glad I did!  The progress I have made has just been fantastic and I absolutely love it!   

If you can promise yourself that you will play for 5 minutes a day (which will turn into hours) Start slow, don't give up, persist, push yourself to learn more, but also know when to take a break and rest.   You can do this! 

Pick a guitar you like the look of as you will want to play it more. 

Good luck and have fun!