The oldest logos still working today are older than most countries' current constitutions. The Bass red triangle was registered in 1876, first in line when Britain opened its trademark register. Twinings' wordmark has been in continuous use since 1787. Stella Artois traces its device to a brewery mark from centuries earlier. Levi's two-horse emblem has run since 1886, and John Deere's leaping deer since 1876. None of these survived by accident, and the reasons they survived are a free curriculum.
What the survivors have in common
Look at the list and patterns appear fast. They are simple: a triangle, a deer, a name in letters. They are nameable: every one can be described in a short phrase over a telephone, which is a decent proxy for how memory stores marks. They were reproducible under horrible conditions: stamped into barrels, fired onto bottles, woven into patches, printed on tin, long before anyone could rely on color fidelity or fine detail surviving the trip. The production constraints of the 1800s enforced exactly the discipline modern brands rediscover the hard way: one color, strong silhouette, one feature.
Maintained, not preserved
The second pattern is quieter: none of these marks is actually unchanged. Each has been redrawn dozens of times: proportions tuned, details dropped, letterforms modernized. Shell's scallop has been simplified roughly once a generation for a century. What stayed fixed was the recognizable core, the triangle, the deer, the shell, while everything negotiable evolved around it. Longevity is not the absence of change. It is a strong opinion about which part must never change.
Heritage marks are not old designs that survived. They are continuously renovated designs whose owners knew which wall was load-bearing.
The uncomfortable half of the lesson
Survivorship deserves its warning label: thousands of equally old marks died with their companies, and a great logo saved none of them from bad products or bad balance sheets. The honest claim is narrower. A simple, ownable, endlessly reproducible mark removes one common reason to rebrand, and every avoided rebrand is decades of recognition compounding instead of resetting. The triangle did not make Bass immortal. It made Bass recognizable for 150 years at near-zero maintenance cost, which is the highest return in branding.