I know a lot of people including my dad and several of his friends who picked up music and programming after retiring from their 30 year old accounting job at t

I know a lot of people including my dad and several of his friends who picked up music and programming after retiring from their 30 year old accounting job at the age of 62. Also many people like to term this as an exception rather than rule, but know that it is not. My observation has been that people who lack the motivation are either the ones who are constantly stressed with their job and life, or who are content with what they know. Take some time off from work, meditate, be idle. Your mind will automatically want to do something that is productive. Most of these researches are averaged out observations which say no more about your ideal bp than I can by looking at you. So please learn all you want and please don't base your decision to learn new things based on a generic research result. And no MIT is not an authority on your life. If you really want to know your brain health, go get an fmri, but please don't let your desire to learn be dictated by what others say.