Nineteen
Yeah-it's like an inside joke at my school. If someone says, "Barbara Streisand" the person they said it to goes, "Oo-oo-oo-oo-oo-a-oo-oo-a-oo-oo-a."
If I marry a European guy, I'll make sure his last name is Streisand, then if my kid's a girl, then I'll name her Barbara X3. That way if I call them, they'll respond with the theme X3. Jk, of course.