If you think you might be too old to get into acting...

It is never too late to start acting. However, your chances of earning a living as a professional actor are extremely small. Of course this is the same for just about anyone who wants to become a professional actor. Take a look at the AWOL lesson, AN ACTOR'S LIFE... on the AWOL homepage.
 
If acting is something you feel driven to do, I suggest you take some classes and get involved in community theatre and whatever local film, TV and industrial productions you can find. This will help satisfy your creative desires and earn you a few dollars once in a while. Who knows, after awhile, things might lead you in a professional direction after all. Just don't quit the day job yet.

Considering how competitive the business is and how many actors have a big training and experience jump on you, you will have to be quite focused and work hard to get trained, develop experience and learn about the business. You should not wait any longer to prepare yourself to compete. This means lots of workshops, classes, auditions and reading every acting book you can find. It means classes in singing, dance, literature (even poetry), music, improvisation, etc. It means a lot of hard, focused work.