Jake has a unique set of abilities called Stretchy Powers that allow him to manipulate the shape and size of his body, coming in handy on innumerable occasions throughout his and Finn's adventures. Jake was 28 years old at his debut in "magical dog years," and ages throughout the series, though he rarely acts mature. It is inferred that magical dogs have a lifespan similar to Humans, as demonstrated by an aged Jake in "Dungeon Train."