Where are you? If you want to do it fast, get an FAA PPL - you could get everything done in a couple of months. To be honest your biggest problem is going to be the CPL/ATPL exams. They aren't exactly easy! Then you need to consider what you can do with a CPL - You'll be 56 by the time you get the licence and you won't be able to fly commercially past age 60, so your only realistic option is to become a flight instructor. That's going to require at least 250 hours.