You're about to enter your prime time in terms of professional life. Your experience gives you a good understanding of risks (technical, people, etc.) and means

You're about to enter your prime time in terms of professional life. Your experience gives you a good understanding of risks (technical, people, etc.) and means of achieving goals. You mostly control the flow of events in your life, rather than the other way around. If you've been thinking about doing something significant, early 40s is the best age to step out of regular routine and do it.