I've only been doing it for 21 years.
The only thing that hasn't changed is..nothing.
I started out running a Dec Mini-Vax about the size of a washing machine, only much louder...(we still remember the blessed silence in our office/server 'room' the day it was finally turned off.) using (IIRC) kermit to connect to it from my desktop.
Cut my unix teeth on a HP/Apollo franken-unix thing: part SysV, part BSD.
All the machines I am sysadmin for now are Linux VM's, except my desktop systems...which all run OS X....so, yeah, still using Unix.