I got my first amp for Christmas when I was 12, after that I found what I liked and stuck with it. I had a bunch of loaners and rentals in between when looking for a new amp, but once I found "the one" I was fairly content.
List of amps I've actually owned, not including rentals or loaners:
Sears Solid State
Peavey Classic - Vox 6x10
GK250ML - rebuilt Vox cab to 4x10 stereo
Peavey 5150 Combo (stolen)
Peavey 5150 Combo
Krank Revolution Series One, Krank Rev cab 4x12 Eminence Legends
Krank Chadwick I, Krank 2x12 cab Eminence Swamp Thangs
Krank amps are concurrent.
That's it in 34 years of playing.
EDIT:
Oops, forgot practice amps...
RockMan Soloist
MosValve somethin'
Kustom whatever..
Peavey StudioPro Transtube thingie.