Signing your first lease is when “adult” stops being an age and starts being a list of due dates.

The number on a birthday cake has very little to do with it. What actually arrives is a set of dates that do not care how you feel: rent on the first, bill on the tenth, deposit before you get the keys. That transfer of consequences is the real border crossing.

You can practise the system years before you need it. Put your own due dates in one place: the form, the fee, the shift swap, the thing your coach needs by Friday. One list, checked on the same day each week.