how do i start business at the age of 17 ?

I started early too, basically to start off Id write down some frequent problems you encounter over a week and see if other people experience the problem. If it's that much of a burden and people will pay you for it, do it. If you know how to code I freelance. Dont spend years polishing something that no one needs because its a magical idea, execution is a huge piece of the process and not something to be neglected.

Your questions are not necessarily the same. Earning some money at age 17 is different from starting a business at age 17.

There's not a lot stopping you from starting your business right now, you just need to identify what you'll be doing and that depends entirely on your current skillset and what you're willing to learn.

I started my first "business" when I was 13 years old, that was with a couple of apps that I decided to build and publish. It was surreal. I was able to find all the resources that I needed on the internet and the experience was a little bumpy (being 13) but it was fun and I learned a lot. So there's really nothing actually stopping you in terms of i-am-not-an-adult.

At this point, I would recommend you to just do things without thinking about them as a business or focusing on the money part. That will help you develop skills and also help you think about what you're good at and what kind of business can you actually run and grow. It's good that you're thinking about it early, but you should also know that this path is significantly harder than your usual getting-a-job.

Best of luck!

There isn't much you can't do that an adult can...

This is hard question to answer because it depends on your current skillset, and more important, what skills you're willing to learn/acquire.

At your age, it's more important to just make things, develop skills and not worry too much about making money. Start a blog, make a video game, do whatever interests you.

Getting a job in a field that interests you may also be a good idea to get paid while learning.

But if you really insist on building a business, it's always a good idea is to start small. See step #1 here: https://robwalling.com/2015/03/26/the-stairstep-approach-to-bootstrapping/

Not knowing anything about you, I'd try:

1. Identifying what you're good at
2. Identifying people who will pay you to do what you're good at
3. Identifying the channels to reach those people and tell them how good you are

Can you teach other 17 year olds how to do XYZ? Are you good at identifying valuable antique chairs? Are you able to find interesting articles?

If you can code, that obviously makes it easier, but isn't essential.