"Age Ain't Nothing but a Number" is a phrase that suggests age should not limit one's experiences or relationships. It emphasizes that maturity and capability are not solely defined by how old someone is. This idea is often reflected in various aspects of life, including friendships, careers, and romantic relationships. The phrase gained popularity through the song by Aaliyah, released in 1994, which discusses love and attraction regardless of age differences. It highlights the importance of emotional connection over societal expectations, encouraging individuals to embrace their feelings without being constrained by age-related judgments.