The Senior Citizens are a group of characters in The Amazing World of Gumball. They possess stereotypical geriatric traits and partake in stereotypical geriatric activities, such as 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 Bandage 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 the Cyclops 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": Their 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 Cartax.
- "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 Brydie, 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.
- ”The Deal”: Betty is screamed at by Nicole.
- ”The Lady”: He crossdresses.
- ”The One”: Marvin is on the bus.
- ”The Father”: Louie is at a family reunion. Marvin later appears in two cars.
- ”The Intelligence”: Betty, Marvin, and Donald are at the library, and show the townspeople how to live without the internet.
- ”The Potion”: Betty and Marvin are on the bus.
- 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.