Boom... Like being a parent or taking care of parents.<p>For me it was when I got married.  At first it was like cool and then it dawned on me that as head of household, I was responsible for more than just ME!<p>Once my kids were born, a different type of adulthood settled in.  The decisions that I had made earlier in my life about things like moving, finances, and doing stupid things on the weekends with my wife weren&#x27;t as easy to make or not even possible.<p>And now as time has passed, I&#x27;ve had to deal with aging parents.  I now talk with my mom and dad as an adult and not a child.  Our discussions when dealing with serious topics related to health or family now weigh heavier on me.  I now carry a sense of responsibility with me that I just can&#x27;t shake.<p>For me the moment I entered adulthood was the moment I couldn&#x27;t shake my responsibilities anymore.  I also want to point out that I choose to be responsible.  Could I decide tomorrow to be irresponsible? Hell yes, but I choose not to because I have people that depend on me.<p>One last thing, being an adult does not stop me from doing kid like things.  I still play plenty of video games like my favorite Black OPS 3 (many hours have been thrown into that black hole of time) and watch cartoons like Bleach (soap opera for nerds).<p>My two cents worth.