The Senior Citizens are a group of characters in The Amazing World of Gumball. They do stereotypical "old-people" stuff, like taking part in senior talent shows, sitting around on lawn chairs, retelling stories of their youths, and saying comments such as: "What did he say?"
- "The Responsible": Gumball and Darwin bump into Marvin while walking Anais at the park. He treats Anais as a pet, prompting her to bite him.
- "The Debt": All of them appear at the talent show (except Betty who is replaced by a yellow old man) - four of them performing, and two of them in the audience.
- "The End": The men appear as background characters standing in line in the supermarket.
- "The Laziest": Four of them are lounging out in a yard, when Gumball and Darwin ask them about Lazy Larry.
- "The Prank": Marvin watches the paramedics take the bucket off Richard's head.
- "The Kiss": Four of them appear lounging out in a yard when Donald asks Gumball to give Granny Jojo "a big kiss from me!"
- "The Goons": Marvin joins the Dumb Race, and accidentally runs over Gumball and Anais with his electric wheelchair.
- "The Poltergeist": Donald is seen at the cinema in Mr. Robinson's flashback, as well as the yellow old man.
- "The Wand": Marvin is seen at the cinema in Richard's flashback.
- "The Colossus": Four of them are sitting on the front porch during Hector's rampage.
- "The Knights": Louie can be seen walking a dog in the beginning of the episode.
- "The Job": Marvin and the others were shown through the television news broadcast, when Marvin was floating mid-air.
- "The Words": Marvin is seen in a photo.
- "Christmas": Marvin is at the hospital.
- "The Watch": Marvin gets into a fight with Gumball over a watch.
- "The Bumpkin": Marvin is in his car.
- "The Flakers": Marvin fails to do sit-ups.
- "The Pony": Marvin loses DVDs.
- "The Tag": Marvin greets the Hexagon Lady.
- "The Castle": Louie is one of the uninvited guests at The Wattersons' house.
- "The Boombox": Donald is a contestant on Win or Don't Win.
- "The Tape": Marvin is iin a videotape.
- "The Plan": Louie is seen walking a dog at Elmore Park.
- "The Finale": They chase after the Wattersons because they have stolen their scooters.
- "The Kids": Louie comments on Gumball's appearance during the "Make The Most of It" montage.
- "The Name": Marvin is seen at Food N' Stuff.
- "The Extras": Thier first major role.They appear in the "Just Notice Us" montage, and later, they dance to the tune of a song on a radio.
- "The Law": Marvin dodges the Doughnut Sheriff's car.
- "The Allergy": Marvin gets knocked into by a car.
- "The Mothers": Betty is helped out by Banana Barbara, and Marvin is later in the crowd.
- "The Shell": Marvin is in the theater.
- "The Man": Louie is Granny Jojo's new boyfriend.
- "The Pizza": Marvin gets attacked by a tiger.
- "The Lie": All of them (excluding Louie) sing Sluzzle Tag carols at the mall.
- "The Butterfly": They appear in the mall.
- "The Question": Marvin is in Elmore Park.
- "The Oracle": They are one of the many people who want to be the 1,000,000th costumer.
- "The Safety": Marvin is on Darwin's safety monitors.
- "The Spoiler": They appear in the cinema.
- "The Countdown": They all appear on the city bus.
- "The Nobody": Marvin is seen in line for hot dogs.
- "The Downer": Marvin is watching Gumball cause a traffic jam.
- "The Nemesis": Marvin is on the public bus once again.
- "The Crew": Their second major role. Gumball and Darwin learn about the crew.
- "The Signature": Louie has a major role, while Marvin is at the City Hall.
- "The Check": Louie gives Gumball, Darwin, and Anais a check.
- "The Parking": Marvin fights with the Wattersons over a parking spot, and the Wattersons drive Betty to a bus stop. Donald is also seen exiting the parking lot.
- "The Romantic": Marvin is part of the musical number.
- "The Wicked": Margaret steals Marvin's car, and Betty is later seen at Joyful Burger in the mall.
- "The Traitor": Marvin can be briefly seen at the cinema.
- "The Signal": Marvin is seen driving his car on the expressway.
- "The Awkwardness": Marvin is seen in the crowded bus.
- "The Nest": Marvin and Donald are victims of the Evil Turtle's Babies.
- "The Bus": Marvin is seen in his car on the expressway.
- "The Night": Marvin is seen throwing stuff at the Moon.
- "The Fury": Marvin is seen driving his car on the expressway.
- "The Compilation": Marvin drives over a speed bump, sending his car into a pileup.
- "The Guy": Marvin is one of Gumball's "Spot and Burn" targets.
- "The Boredom": Marvin is almost knocked down by Doughnut Sheriff's car.
- "The Choices": Marvin's younger self is seen protesting with Mr. Small.
- "The Code": Marvin is seen riding the bus.
- "The Slide": Betty tells Gumball, Darwin and Rocky where she saw Byrdie, and Marvin is later seen leaving the hospital.
- "The Loophole": Betty's purse is stolen by Bobert.
- "The Console": Gumball, Darwin and Anais attacks Betty and Marvin in the park.
- "The Ollie": Marvin is among the people laughing at Gumball.
- "The Catfish": Betty and Donald appears in Louie's flashback.
- "The Cycle": Marvin appears in the mall.
- "The Weirdo": Sussie eats Betty's mobile phone.
- "The Heist": Marvin appears in the bank.
- As plaid is a pattern native to Scotland, Donald has a Scottish accent.
- Louie resembles Disney's Mickey Mouse, and the Rat from the newspaper comic Pearls Before Swine.