I have a kid who started something at a young age and has had incredible success with it.
She started it because she had a personal experience and was compelled to act. She is years into college and she continues to do this same work because it is personally meaningful and fulfilling for her. It has nothing to do with her major or necessarily with her future plans, but she is committed to it.
When she had the idea and started working on it, college wasn’t a blip on her radar. She was young enough that it never occurred to her, wasn’t a motivation, and had no bearing on any of her decisions. She has only ever done what she or someone (friends and classmates mostly) working with her can do. Because of that, there is no website, not glitzy marketing stuff, etc.
Guess what? She achieved the dreams you have for your kids — not because she created a 501c3 to look good for college admissions (it’s not even a 501c3; she has a component fund at a small community foundation), but because she has passion and has made an impact.
Frankly, what you are doing is exactly what gives youth-led work a bad name. There are some kids out there who are doing things out love, passion, and compassion. Family efforts like yours make everyone else look at anything a kid starts with skepticism.
As others have said, there are a million ways for kids to show commitment/leadership/engagement without starting something new. There is also rarely a need to start a 501c3. My daughter is part of a cohort recognized for a broad swath of youth impact. The organization who has recognized/rewarded them purposefully looks for impact beyond 501c3. They know that 5013cs are typically unnecessary, unnecessarily complicated, expensive, time consuming, and parent-led. They are a sign of privilege, not a sign of ingenuity or service.
I am intentionally being vague about the organization who recognized her, but I assure you it is something that you would want and would think your kids might get for doing what you are planning. They won’t. Your motivations will be transparent.
A big red flag for me was not only that you said you wanted to do this for college admissions, but also that your first comment was to “start a 501c3.” You didn’t say that they wanted to help people, make money, build something, invent something, educate, explain, unite…you said they wanted to start a nonprofit.
The next red flag was that you were worrying about formal roles and titles in a non-existent organization. Why? Your kids are probably 12 and 14. If they cared about doing something meaningful, why do they care about titles at this point?
Your kids may well get into an Ivy League school, but it won’t be because they started a 501c3. In fact, it might be in spite of it.