How much quality time can you afford to spend with them if you are trying to build a successful business at the same time?The flip side of that is that older folk are more likely to have had the time to learn the most effective ways to manage their own time, had the opportunity to get the kinks out of managing people, delegating tasks, hiring people, etc. Makes it a lot easier to get the space for quality time (and, indeed, realise that quality time is necessary for you to be the most productive in anything but the very short term).
So, for me anyway, the answer is "quite a bit thank you" (Helped by the fact that we run the business together ;-)
I always thought that starting a new company was driven by the fire of youth, but it seems like it is mid-life crisis that may also be responsible in many cases.
Or maybe it's having more experience in judging whether something is likely to be successful or not. I was much less nervous starting a new company this year than I was the last time in 1999. Large chunks of the fear go away with the addition of experience.