Drew Brees, listen up ... Warren Moon's got advice for winning football games despite declining arm talent -- telling TMZ Sports it's simple ... JUST TAKE CARE OF YOURSELF!!
Moon -- who famously played QB in the NFL until he was 44 years old -- says he knows EXACTLY what Brees is going through these days ... telling us the lack of velocity on the Saints star's passes is now apparent.
But, Moon says he knows there's a way for Drew to still be successful at 41 years old despite the issue .