I met a 47 year old one time and he owned about 100 debt free rental houses. I asked him what his secret was. He replied 2 words. (DEBT FREE)
I will take his advice.
Should have thought about asking him what "debt free" meant to him. I doubt very much that he never took a mortgage.
When I was a flooring sales rep, one of my customers was a former professional football player (back in the old days, when they didn't get rich). He owns over 750 mostly single family homes in the oh-so-high-COL Bay Area. He kept the business so he could get his flooring for cost, and to have access to builders, among other reasons. His answer would most decidedly not be "debt free". It would be "HARD WORK"! I'll take my guy's approach any day.
FWIW, I understand that younger players still come to him for advice on what to do with their money, which is largely irrelevant to this story, but cool nonetheless.
BTW - Do you mean "your" kids? My dad used to call the six of us "you kids", so thanks for the memory trigger, as he's now in hospice, but I doubt that's what you meant.