Hi Rishikesh, I agree with Sahil that its never too late to start and explore something new. Its all about making the right choice and doing what you feel you would do best. The best thing in your scenario is your experience. Having such long experience makes you not only knowledgeable but also wise. You can choose whatever field you are interested in and with your prior experience you will be able to understand it better.
See, you got one life and you can't live it with regrets. A lot of people might not support your decision, and even you might feel uncomfortable going out of your comfort zone and starting as a fresher in a new field. But if you are determined that you will do good, just go and explore the career options.