Of course the body is not the same. Time is more precious. But that really doesn't mean your margin of error is smaller. When I was in my twenties I had a lot less margin for error. Failing a test could mean the end of my degree. Not finding a job meant I could not pay rent. If I fuck up my job now, the worst that can happen is that I get fired. I have enough financial means to support myself and find a new job. There is a ton of risk I could never take as a younger person. Because I feel now my margin of error is much larger.