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What generation is a 40 year old man?: Millennials and Microgenerational Nuances

As of 2025, the oldest Millennials are turning 44 years old, meaning a 40 year old man is firmly part of the Millennial generation. However, the exact birth year range varies slightly between different research organizations, and a 40 year old man often sits on the cusp of Generation X, leading to unique characteristics and occasional classification as part of a microgeneration.