Independence at last and an income to dispose of! No matter how much money you earn in the future, there will always be the capacity to spend it. But it is likely that some major costs lie ahead. The new car, the first house, marriage, children, etc.
Planning for these events now could save a lot of pain and disappointment later on.
Also, although retirement may seem a long way off, planning correctly now will give you peace of mind when that time comes.