This study explores how age diversity influences organizational identification, emphasizing the role of HR practices and the perceived age discrimination climate in Polish enterprises. Background: Anchored in social identity and social categorization theories, the study posits that observable age diversity may trigger workplace conflicts over resources and power, potentially heightening perceptions of discrimination and lowering employee satisfaction. Methods: Quantitative data were gathered from 30 Polish organizations with more than 50 employees. The sample, comprising HR managers and employees, was analyzed using linear regression and mediation analysis. Results: The findings reveal that HR practices promoting age diversity have a significant positive effect on organizational identification, with effective diversity management reducing perceived discrimination and enhancing employee satisfaction. Conclusions: This study concludes that inclusive HR practices are vital for integrating diverse age groups and ensuring equitable opportunities within the workplace. Future research should investigate the long-term organizational and employee outcomes of age-inclusive HR strategies.