I think they're almost the same age. Setiawan is like 29, and Ahshan is like 26. Pretty much the same generation, just Setiawan had success earlier in his career. I like Cai Yun/Lu Kai and Fu Haifeng/Zhang Nan. And Yu Yang/Tang Yuanting.
• Fu Haifeng/Zheng Siwei (13 years diff.) - Runner-up MAS SSP 2017 • Mathias Christiansen/Christinna Pedersen (8 years diff.) - Runner-up CHN SSP 2017 & HKG SS 2017 • Greysia Polii/Apriani Rahayu (11 years diff.) - Winner FRA SS 2017 & Runner-up HKG SS 2017