Well-maintained adobe houses routinely last 200 years. Several New Mexico examples have stood for over 400. Taos Pueblo is the oldest continuously occupied adobe in North America, in use since roughly AD 1000–1450. The Palace of the Governors in Santa Fe has been continuously occupied as a public building since 1610. Longevity depends on three things: keeping the plaster coat intact, keeping water away from the wall base, and protecting the roof from leaks. Architectural Digest notes that an adobe home with annual re-mudding can outlast multiple stick-frame generations. The brick itself does not decay; failures almost always trace to deferred plaster or roof maintenance.
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