Here's my 4yo (probably older) HP 5940, obviously not a dust-free environment, that gets prints probably an average of 25 pages/day. Still plugging along. Getting a new print head with every cartridge probably helps in my case.

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1980 300TD-China Blue/Blue MBTex-2nd Owner, 107K (Alt Blau) OBK #15
'06 Chevy Tahoe Z71 (for the wife & 4 kids, current mule) '03 Honda Odyssey (son #1's ride, reluctantly) '99 GMC Suburban (255K+ miles, semi-retired mule) 21' SeaRay Seville (summer escape pod)