My kids went to a local university. We offered to pay all tuition, books and associated schooling costs through their Bachelor's degrees, plus share some of their living expenses like auto insurance and cell phone bills if they lived at home, maintained full course loads, and worked part-time. (With three kids close in age we couldn't afford to support four households yet hated the idea of them graduating college with massive student loans to pay off.)
They lived with us until their mid-twenties, and I even had a GF and a BF under my roof for the last year of it. It was a wonderful experience, a true laugh-riot to have seven happy adults under one roof. We got on extraordinarily well. Everyone worked together and the kids would often pay for and pick up groceries or take out for everyone while on their way home from someplace. I can honestly say it was one of my favorite periods of life and I was sad to see it end. We went from the full gang to empty nesters in less than six months as it turned out.
My husband and I did what we could to support our kids in successful launching and so far, so good. It's been nearly ten years since they moved out and all are self-sufficient, contributing members of society. We know just how fortunate we are on that score.