In Disney’s Frozen, Elsa remains isolated in her room for thirteen years before her coronation.
After Elsa accidentally injures Anna with her ice powers during childhood, the castle gates close and the sisters are separated. Elsa’s parents keep her abilities secret, and Elsa largely stays behind her bedroom door while Anna grows up apart from her. The film then jumps forward to Elsa’s coronation day, when Arendelle’s gates finally reopen.
The thirteen-year period is part of the film’s timeline rather than a separate magical rule. Elsa is shown as a child in the opening sequence and as a young adult when she becomes queen. The isolation explains why the sisters have an intensely close family bond but little ordinary experience together as teenagers.
A common mix-up is confusing Elsa’s thirteen years of isolation with Anna’s three-year age difference from Elsa. The exact age gap is not the same as the isolation period.