There are days - weeks even - when I wonder how I ended up here: mother, voter, composter. It’s all just so grown-up and yet I don’t feel much different now than I did when I was 15 years-old. Becoming an adult is a gradual process, one that we generally recognize as starting with certain milestones like being able to vote or legally ordering a beer. Then, gradually, the responsibilities get bigger and a little more serious and start involving the welfare of people other than …