Grime doesn't really stick on flats the way they do on rounds, so keep that in mind when visualizing 13 year old TIs 
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When playing actively, sitting in your attic doesn't count. When I got my first bass, I went 6 months.
I once went 14 years, not playing for the middle 12. I know you weren't counting that...but I convinced myself that it was all good, old strings. Then I played with other people again. It's not good. It worked/works when music wasn't big time produced with 24 tracks of noise and when guitarists stayed mostly on their higher strings. Dead strings don't really cut through in anything more than a little, quiet combo, no matter how much eq added. But use em if they work for you! No judgment from me.When playing actively, sitting in your attic doesn't count. When I got my first bass, I went 6 months.
I'm on about 8 years and counting.
I've actually had the same strings through 3 basses. Just take em off and throw em on the new bass.