Facial age estimation is a critical task within computer vision, with wide-ranging applications in demographic analysis, video retrieval, and access control. Prior research has highlighted that facial aging is significantly influenced by attributes such as gender and ethnicity, which present substantial challenges to achieving accurate and robust age prediction. To tackle this challenge, we propose MSAN, an innovative end-to-end age estimation framework that integrates auxiliary information, including gender and ethnicity, during the prediction phase and dynamically models their interactions with age. Extensive evaluations on multiple public datasets demonstrate that our model outperforms several state-of-the-art approaches. This study provides an effective solution for enhancing the accuracy of facial age estimation.