I am hoping to hear suggestions or real-life experience of anyone who has gone back to do their Phd after turning 50. My wife and I, both professionally and fin

I am hoping to hear suggestions or real-life experience of anyone who has gone back to do their Phd after turning 50. My wife and I, both professionally and financially settled, are looking to stop working at 50, and take up something close to our hearts, which will be our _second_ 20-year innings. We would like to start that innings with doing a Phd in that field. We both have Masters and an MBA in our respective fields. The next innings will be based on our current experience (30+ years) and our education, but hoping to apply it in a macro, policy framework, for which will go back to study.