Here areĀ screenshots of Adobe Photoshop throughout history. I started using photoshop around version 4 or 5 (actually if you count when I was a kid, then 1988, but I really didnt start using it for work/school until the late 90s).
Photoshop .063 – 1988
Photoshop 1 – 1990
Photoshop 2.5 – 1993
Photoshop 3 – 1995
Photoshop 4 – 1996
Photoshop 5 – 1998
Photoshop 6 – 2000
Photoshop 7 – 2002
Photoshop CS2 – 2005
Photoshop CS3 – 2007
Photoshop CS4 – 2009
Photoshop CS5 – 2010
Source: http://orwells1984blog.blogspot.com/2011/02/evolution-of-photoshop.html