In your 30s, you're aware and thankful that you're passion allows you to provide for your family. It takes long hours and lots of work, but gives your loved ones a lifestyle that you're proud of. The neighbor kid mows your lawn for $20 per week.
In your 40s you start to relive these things vicariously through the new crowd, eager and energetic. Long nights, desperate deadlines and high pressure projects are tiring. You've racked up a lot of these at the expense of your personal life. Your kids are old enough now to mow the lawn for you.
In your 50s you wonder how much of you this company and these people deserve. The 20 somethings look at you like you've checked out. In reality, you're just trying to do better at balancing your effort against what really matters to you. This puts you in the slow lane on the running track. The endless possibilities are staggering, and no longer fun. You'd rather spend your time in the yard or doing something else relaxing.
Different things will be important to you 10 years from now. That doesn't mean you're wrong today, or then. It's just the way it works... for most.