I'll go for 24! By then I'd learned to drive a car, a steam roller, and a road racing motor bike, which I rode in Australia wearing hot pants and a midriff top. The very first time I took my 'bike out, I was stopped for speeding by the cops. That has to be a world record. I'd shipped steam engines from Australia to the UK (subsequently the Australian government made a law against this). We came back to the UK when I was 24 and bought a car with cash, and a house mortgage free. Life was good. On a sunny day I still wish I had my bike, sadly with 2 knee replacements it would be unwise, and my husband has died so no one to ride with. It's so important to take advantage of any opportunities that present themselves, so we don't live life with regrets.