Let’s keep it simple. Kylie Jenner was 20 years old when Stormi was born. She turned 21 a few months later. If you want to be super precise, she was 20 years, 5 months, and 22 days old. See? I did the math for you. You’re welcome.
Today, Stormi is a sassy little fashionista who bosses around her baby brother, Aire. Kylie is a billionaire, a boss, and a mom who occasionally wears sweatpants. So, the age question is just trivia.