You sound like me. That's my plan when our kids are grown. Nothing cheese me more than to hear people complaining about their parents spending "our inheritance". I already told my children we can help them a little when they go to college, but since there are five of them they have the choice of working their way through college and having us take care of ourselves or we can pay for college and then we can move in with them so they can take care of us, since we'll be broke. My children liked the first idea better.
You have a great plan...we had our two boys and always planned to pay for their college education...but our older boy died early, age 15 from leukemia...so we just had our younger boy to educate...still, tuitions pmts, and room and board, books, airfare, miscellaneous spending, all those were greatly expensive...but I just took on another job, and the husband took on even more overtime work, and we did it...
My son worked during the summer months, and never bothered us for any money...our deal was, he was to study in college, and we would pay for it, and so long as he grades remained excellent, we would continue paying...we just did not want him working while studying...but that was just our feelings on this matter...
Now my son earns at least 3X more than my husband and I ever earned together...and he does realize that his education that we provided him, the tools we handed over to him to deal with life, and our love for him, are all that he needed...he wants nothing from us, other than to insist we enjoy our retirement, spend our money, and visit with him, when we are around...