Congrats to your son, scaredy. Hope all goes well for him.
Agree that seeing/helping your kids, family, friends achieve their goals is one of the greatest feelings in life, and not just because of the material rewards they will reap, but because they achieved the goal(s) they went after, and didn’t settle for something less than what they really wanted.
As far as the overall meaning of life, or lack therof, that’s clearly different for all of us, and I’ve found that discovering/coming to terms with whatever that means to you is what really matters.