I'm 51 ands my personal experience to date has been that I am way more effective in business now that I have ever previously been. I certainly put in less hours

I'm 51 ands my personal experience to date has been that I am way more effective in business now that I have ever previously been. I certainly put in less hours (now only ~40-45/wk as I have a 4.5 year old and various other commitments), but now I have made so many mistakes over the years that I generally focus on what really matters and am finding my impact is substantially greater than it was even though my effort is much lower.