This essay is definitely something to keep in mind, albeit it's probably easier in theory than practice.
I'm probably a little older than most of the Y crowd. I've worked at a few very successful startups - pre and post dot com. For one of them, which changed the travel industry, I was literally one of the first people to put down code and my own stab at defining their architecture - I was there before there were any formal employees.
But now, I have a kid on the way, never really made millions (sorta got close), can't seem to find that 'magic' again, and there is definitely that notion that time is fleeting. Over the past decade I studied a lot of philosophy - mostly buddhist and hindu. I meditated, quieted my mind, enjoyed my moments, and felt very peaceful while the world flew by. I dropped out of working for a year to learn how to write electronic music (played music my whole life, got pretty good at the electronic stuff) - this was probably the happiest I'd been in a long time and I 100% did live day to day, creating, constantly getting better.
Lately over the past few years though, life's changed. The thought that I am getting closer to getting older and starting a family adds additional pressure. It seems much simpler when you're by yourself - which is why monks follow that route. Ultimately, we make the decisions we make and we have to learn from them.
As someone who's been programming most of my life, loves technology, and still appreciates the latest and greatest, I'm still drawn to it. At this point, I can see how things should work and feel like I really appreciate things that are designed well. However, there's only so much time in the day and I don't really crank on code for 10+ hours anymore. I keep thinking that I can compete with a lot of people for tech knowhow, but maybe my real potential is to pass all this on to the next generation.
I'm sure that I've been more fortunate that a lot of people on this rock, but I still don't feel I've felt that success I've wanted and, yah, it does feel like time is running out.