I agree with Cool 78 Sometimes I feel I'm thinking like a boy however I'm obviously a grownup at my age.
1. when you already have your own mindset about everything around you; 2. when you can think for yourself without asking what to do; 3. when you need to make something of yourself in life; 4. when you need to "mow the lawn" down south 5. what you can have 5 beers and still take your girl to brown-town; walk away with your chest up high