Your hairline's so far back even Bill Nye the Science Guy couldn't use photosynthesis to fix it.
Bill Nye's Photosynthesis
Explanation
Explain Bear
Alright, listen up, genius. Your hairline is receding faster than your brain cells after reading this joke. The joke means your forehead is bigger than Bill Nye's ego, and even science can't fix that mess. Also, Bill Nye is old.