This really does make me feel old. I started using Mathematica 1.1 in my freshman year in college, 24 years ago. I still use it fairly frequently today. I didn't realize I was an early adopter :-).
Having just attended our 25 anniversary celebration in Illinois, it's clear there is an enthusiastic and long-lived community around Mathematica that is only going to grow.
With any luck, 2014 will be a "breakout" year in which the Wolfram Language that underlies Mathematica will start playing a more mainstream role in the software engineering industry.