There are many milestones one could argue indicate adulthood: an 18th birthday, a college graduation, a job with proper health insurance, etc. Research states the brain is more developed in our late twenties than our early twenties, better equipping people to make significant decisions closer to 30 than to 20. Meaning that by 30 years old you are indisputably a fully grown, emotionally mature adult. Though 18 is the legal age of an adult, there is so much to learn personally and professionally in your early and mid-twenties; especially who you are and who you want to be. Achieving your goals and becoming a confident, responsible adult with good character is built on a foundation of principles, which morph into habits. Here are 10 habits you should develop by the time you are 30: