That is simply not possible today. I did the same as you, but my kids could not come close to the same thing.
My kids worked through school, and probably contributed as much as I did (percentage wise.). But they also make twice what I did upon graduation. In 1983 I made about $16,500. My daughter makes about $45 an hour.
That’s because the feral government started handing out student loans like candy.
https://www.in2013dollars.com/College-tuition-and-fees/price-inflation