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I'm 5 years older than you and that t-shirt (very nice anyway!) still makes me think of late 1990s/ early -00s so it's still not THAT old. I owned an actual IBM PS/2 XT as a kid and they were not color-coded [1]

[1] http://john.ccac.rwth-aachen.de:8000/alf/ps2_76/ps2_76_2_ful...

Yep, the colors come from the PC System Design Guide [1] developed by Microsoft and Intel in the late 90s after IBM completely lost control of the PC market.

[1]: https://en.wikipedia.org/wiki/PC_System_Design_Guide

I'm that old! Now I want a similar shirt featuring the back side of an IBM 5170

That's cool, I love the colors