Starting a startup can be a life-consuming endeavor, much like having a child. As a co-founder of my first business at the age of 16, I found it to be a fantastic start to my career. However, I also had to sacrifice a lot of the typical experiences that most late teenagers have, such as partying, attending university, and developing social skills. While there is no right age to start a business, it is essential not to rush into it. It's important to enjoy your younger years in the way that's best for you, as you still have many years ahead of you to start a business when you're ready.
Hmmm, I think generally those over age 12-13 can start on their own business and not suffer much from it. It's a lot of work to be a founder, but if you have ideas and aren't afraid of the occasional "No" and putting in a lot of time and effort, go ahead! At your current stage, the worst answer is a no, but that doesn't mean you still can't try asking elsewhere or trying to fund it yourself.
Are you in college? If so, I’d recommend you at least try and enjoy those four years first. It’s an experience you can’t reproduce later.
I don't think age has to be the defining factor if you prepare well for presenting your idea