I just turned 40 as well. Over the hill? I don't think so...I'm learning as much now as I was at 25. I've never been involved in a startup. I spent a few years as a sysadmin, then got out of the business to become a cartographer. I'm interested in technologies surrounding GPS and GIS.

I learned about computing on a TRS-80 and the Commodore 64; when I got to college it was VAX and Digital UNIX. I started with BASIC and C and I'm learning Python and Ruby.