The Loud House/Instances by character

Example.jpg|Caption2 At 5-years-old (4-years-old before Season 5), Lisa is the second-youngest of the Loud siblings. She is often seen working on complex experiments, equations, and formulas. Lisa attends the first grade at Royal Woods Elementary School.

Lisa, despite her very young age, is a Junior Nobel Prize recipient. Though she is still in first grade (kindergarten in the first four seasons), she is exceedingly smarter than the other kids her age and is shown to be capable of moving up at least six grades.

The comic "It's Just a Phase" reveals that she started doing experiments at around age one, but it was believed by her parents to be "just a phase." The comic also reveals that back then, her outfit consisted of her glasses, a green T-shirt, a white lab coat, a diaper, and pink booties. wet lather and scrub