Performance Management Systems, it's Processes and the effect on the Ageing workforce

Good morning, First post ever... I am working on a research that seeks to explore the experiences around performance management systems, its process and the effect on the ageing workforce. And I would like to have landmark literatures that researched both areas together. Literature on the AWF and on PMS are many but few seem to actually look at the 2 topic areas together in depth. please can I have some literature to give more bite to my research. came across the below but need more literature: www.cipd.co.uk/.../what-works-in-performance-management-report www.employment-studies.co.uk/.../managing-older-workers Thank you