Note from bevscountrycottage.com:
Based on a beanie hat Josh Groban used to wear

Sizes and Needles:
Size 6 needles
65 sts fits 2-4 year olds
72 sts for 5-8 yr olds
Size 8 needles
75 sts for tweens
82 sts for teens and adults

Option:
Pattern includes instructions to add a crocheted bunny for a more girly hat.