That's my hope too. At 36, I still enjoy what I do and have zero desire to move into management or run my own consulting business (I like the security of steady pay). While software is considered a young man's game, my hope is that this is mostly because historically it's a young industry and that I'll age along with it.
I've been doing this 15 years and am better than I've ever been. The key is to keep on growing and learning. I naturally love learning new things so that keeps me relevant and productive, and I hope to continue doing it the rest of my life. Or at the very least another 20 years (I'm 36) so I can pad my retirement savings before moving to a freelance / consultant lifestyle).
Also, call me crazy, but I don't really care about continuing to climb the pay scale or company charts. I make enough now and like what I do. More money is great, but my overwhelming focus is on keeping a rewarding career going and not continually earning more and more.