The hours rule is nonsense. You can of course change career at 43. However, while we are all born with relative potential, intellectual capacity and more import

The hours rule is nonsense. You can of course change career at 43. However, while we are all born with relative potential, intellectual capacity and more importantly, personality play significant factors. Intellectual capacity doesnt change much until past about 70 and it's tied to long term diet, lifestyle and external factors. Personality is also largely plastic past the age of 6. It can shift over time, and this is one of the advantages of youth, you are still malleable. Age beings to rob this from you as routine and habit starts to build up parts of your brain. Change takes time. 43 is still young in the grand scheme of things, particularly in 2022, but you must question if the change you want is simply your personality being novelty-seeking or the grass being greener elsewhere. One good reason is if your personality fit has been bad to your current work.