@gungasnake,
For whatever reason, you seem to badly want to minimize Ali's achievements. After beating Norton in 1976, he retired, as world champ, at age 35.
Unfortunately, like others before him, he nonetheless returned to the ring after that due to financial need. He won the fight against Shavers, but his doctor quit because he told Ali he was not physically fit to fight. Among other things, his kidneys had "fallen apart."
After beating Spinks in their second fight (1979), he once again retired as world champ, now 37 years old. But once again he came out of retirement, against doctor's advice. By the time he fought Holmes in 1980, his last fight at the age of 38, he was already manifesting a stuttering voice and trembling hands.
His last fight was pitiful, but his last few years, fought in poor health at an extremely advanced age (for a boxer), are hardly definitive of his career. Yet you seem to want to treat them as such. Why is that?