For me its been even longer: The last band I was in that did any cover material at all was in 1996. I loathe learning and playing other people's songs and just won't waste my valuable playing time that way anymore. Really, I always hated it, except for when I was young and first learning to play, but it was a means to and end when playing in bands for money.
I can relate.
I don't write much for myself, but I work as a writer and it's very satisfying creating new things. I have a very old BMI number (joined at 15) and I still receive royalties for things I did in the late 1970's early 1980's.
I still enjoy playing the songs I grew up listening to and seeing people having a good time with those classic songs.
My wife is in the photo below in a blank tank top.
Probably my greatest fascination/satisfaction is getting paid to do something that I truly love. I almost see it as this fantastic impossibility that came to fruition.
With the original band Outfall, everything is original material. I was hired on as a replacement guitarist and they already had 2.2 million views on their page and a strong online following, so that was intimidating for me coming into the band as a brand new member.
Regardless of the genre, those are big shoes to fill because everyone listening is evaluating you against the previous guitarist.
Teaching is also a super satisfying experience. My job is teaching/mentoring 'live performance techniques,' so it's very cool to be a part of seeing students take the stage for the first time.
I'm still not really comfortable with my own music, but it is constantly evolving along the way...