Turning 30 is a big milestone in your life. You're making your goodbyes to young adulthood and slowly coming into your own. With age comes great responsibilities, and at the top of your list should be taking charge of your money. Our finances play a huge role in our lives — money is always one of the top stressors, and it causes the biggest discord among couples. To help you get on track, here's what you ideally should have achieved by age 30.