Sofia the First is such a nostalgic character for me! She debuted as an 8-year-old in the Disney Junior series, and while the show doesn't explicitly show her as an adult, we can piece together some clues. The series finale, 'Forever Royal,' features a time skip where Sofia is crowned queen, appearing slightly older—likely in her late teens or early 20s. Given the show's timeline and her growth, I'd guess she's around 18–22 in that scene. It's fun to imagine her adulthood, especially with how the show hinted at her future leadership. I like to think she'd be a wise, compassionate ruler, just like her younger self.
What's really interesting is how 'Sofia the First' subtly matured her character without losing her core kindness. Even in the 'Elena of Avalor' crossover, she carries herself with more confidence while still feeling like the same Sofia. Disney never confirmed an exact adult age, but the way she’s framed in later episodes suggests a young adulthood—old enough to rule but still relatable to kids. It’s one of those details that leaves room for fans to speculate, which I kinda love.