How Much Of China’s Fighter Jet Fleet Is Still Obsolete Or Out-Dated?

While the Chinese People’s Liberation Army Air Force (PLAAF) and People’s Liberation Army Naval Air Force (PLANAF) are rapidly modernizing, what old fighter jets do they still have in service? Currently, China has eclectic mix of ancient 2nd/3rd generation fighter jets operating alongside 5th generation fighter jets and some of the new Chinese fighter jets (like the J-20 Mighty Dragon) are considered capable.