I voted 30+. I started my first full time job before I finished high school. I took over the family farm the spring of grade 12 (age 17). Left in April to seed the crop & returned in June to write final exams, did fine. Over the next 7 years, I farmed in the summer and managed to get my BSc. Handed the farm to my brother and headed to Megacorp.
18 years (and a couple of Megacorps) later, DW & I had a mortgage free house, 2 kids and 1 income. No savings to mention. Yet another Megacorp to the rescue. Finally started serious savings, got stock options. Options were worthless for years as stock price didn't move, some expired worthless. Then, about 4 years ago, Megacorp became stock market darling. Sold ~50% for mid 6 figures, selling slowly since. In the meantime I built up ~1KK in DC pension. Certainly FI and ready to RE with a SWR of ~125K at 57. 40 years exactly, but I was LUCKY.
Disclaimer: DW is expensive. It may be possible to have a SWR the same as ours but not require the same nest egg.