You can have plenty of entrepreneurial fun from any age with a bit of street smart without selling lemonade, which would get you a kicking here in the UK. I've

You can have plenty of entrepreneurial fun from any age with a bit of street smart without selling lemonade, which would get you a kicking here in the UK. I've managed to in the last 20 years, apart from my regular grind: clear out schools of old equipment, broker Sun kit on ebay, sell land rover bits, do structured cabling, fix people's laptops, build electronic kits for a fee, dig holes, build sheds, unblock drains, refit DIY stores, distribute fireworks, flatten boxes, skip diving + ebay, selling fruit picked off scrub land, destructive furniture testing, car washing, copper recycling and returning trolleys to a supermarket. Plus probably more things I've forgotten. I've worked at two successful startups so far and TBH they weren't as fun as most of the above things.