If you enjoy your job and continue to for that long, great. There are plenty of people who don't want to be doing the same thing day after day for the next 30 years. I think the same can be applied to living in a city, sure plenty of people enjoy living in one place all their lives but I'd argue that they're missing out on opportunities to expand their horizons by staying put all that time.
That said, Lee Clow is in a league of his own - what he has done is simply awesome.