| We are doooomed!!
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Old Man Simmons is a deceased character.
When Bucky the dog died, Linda and Lawrence both stated that he had gone to live on Old Man Simmons' farm. When Phineas found Bucky's remains fossilized in the Danville museum, he also found the skeleton of Old Man Simmons. It's unknown how he died.
Kindly Old Man Simmons
After Phineas and Ferb see Bucky's skeleton, the boys see Kindly Old Man Simon's skeleton. When Phineas asks why Old Man Simmons' skeleton is there, Lawrence Fletcher changes the subject.