[BluePen8]

With the caveat that as long as it doesn't require physical space.

With the cost of space in any major city, anything that requires a workshop, working space, or significant storage space is out of the window nowadays for anyone in a major city.

When I was a teenager my side hustle was buying, fixing, and selling used cars. My dad's was the same with small fishing boats.

The story of these billion dollar companies being started in their parent's garage sounds inspirational and all, but I'd imagine less so for the kids whose parents can't afford home with a garage.

[Valgrim]

Exactly, starting out in a garage sounds like starting out from nothing, but in reality it means that your parents have a house with a garage that they lend out to you for free, where you can do whatever you want (so forget condos undergound garages), and that house is probably not very far from a large city so you have access to clients, employees and resources.

You don't need your parents to be millionaires to get that, but in today's terms this is definitely upper middle class.

[mixmastamyk]

Yes, many of the success stories of the 90s started out like you mentioned, the second paragraph was often, "then I borrowed 20k from Uncle Bob to buy a used Sparc station.."