Wow-- timely thread.
This is related to the one in main right now.
I think that they key term here is "begin."
I do not expect even my nearly 14yo DD to take "most" of the responsibility for her management. Anaphylaxis recognition, we're probably at about 90%, there-- and that transition began at about 4-6yo. I think that is VERY highly individual, though-- DD was ready far younger than many of her peers would have been. Part of this is a matter of experience with reactions-- something that I think none of us really
wants our kids to have.
She also began self-carrying at <3yo, and
is pretty much 100% responsible for her epipens, inhaler, and medic-alert bracelet(s) at this point. I'd say she's been there for about three years, with only the occasional error.
She cannot self-administer reliably; usually by the time it is clear that epinephrine is needed, she is far too incapacitated. I hope that someday she will be able to get that one to about 80%, but given the nature of her reactions since she was about 6yo, I don't think it will ever be much higher than that. That's an ongoing worry.