Over the years I have known many very wealthy people who grew up during the Great Depression and who became wealthy by working blue collar jobs for 40 or 50 years and simply not spending any of it.
Their children generally had no problem quickly spending it all after they died.
I remember a woman who worked as a cashier for Sam Walton, at his 5&10 store. When he bought some bankrupt Ben Franklin stores and reorganized as Wal-Mart she took a stock option with him and remained a cashier for decades. She then retired richer than Midas. Not bad for someone who worked all her life as just a cashier.