I want to start a new career at 52. Is that too old?
Too old? Hardly! Perish the thought! You still have at least another 15-20 years of productivity left in you. Besides, by now you are probably past many of the frivolities of youth and more able to focus on getting the job done. Young enough to enjoy it and old enough to know better, as the saying goes. Good for you. I wish you great success in your new endeavors.