As a 17 year old, I disagree, regardless of age, if someone creates or does something that is considered impressive, they should receive credit based upon that - not because of an arbitrary number that supposedly relates to their ability.
Someone helping me with a project is nice. Someone helping you with a project is an investment in the future. My neuroplasticity wanes with every passing year. Your mind remains limber. I am encumbered by obligations and debts, limiting my flexibility. You have infinitely more options.
Helping you is just a better bet than helping me. You're still on the launchpad, fuel tank still full. If there's something simple, like an encouraging comment or a thoughtful correction, that can be done to help you meet a wonderful trajectory, we should absolutely do it.
The world is comprised predominately of people that either 1) don't like you or 2) are indifferent to you but don't like your work. That's not because their assholes, but just because they're aware of the flaws in you or your work. The sooner one experiences them, the sooner one can start to take advantage of their advice.
someone who is 32yo has had the opportunity to gather at least double your experience.
so being young does have a meaning in 'scaling down' what is expected from you, at least as long we're posting on a friendly news website.
Also, I have met plenty of people who below the age of 15 that were invited to Oxford and Cambridge for maths related events, and they had a greater ability than most the people in the room. So yes I think experience does play a major part, but it is not the only factor. If you have the dedication, then age is nothing but a number.