The job of a parent doesn’t stop when kids grow up.
In fact, some might argue that the unique challenges of parenting young adult children can even rival some of the other stages of child-rearing. Unless they are the type to kick them out of the house at 18 and not give them any more support, there is a lot to be done in terms of encouraging independence, and maybe offering advice so that they can avoid any bad mistakes.
At the same time, being somebody who is on the cusp of independence but still in need of parental support can be frustrating. Sometimes it seems totally inappropriate and overbearing, and other times, it can feel like parents are being way too harsh. Trying to find the balance in the relationship when the transition from child to adult is so recent can be difficult on both ends, and something that provokes arguments.