Is my hearing bad for my age?

I'm learning about decibels, bels, frequency, and sounds waves and what not… And I decided I want to test how well my hearing is. I took a sound test.

Using iPhone earbuds… I can hear from 30 Hz to about 11kHz.
Is that bad for a 17 year old girl? D:

Am I going to be deaf by the time I'm 80? Lol
Are there ways to improve your hearing?

One the hairs go down they they don't jus go back up. But i'm with you loud music everyday and i've been to concerts and clubs

Hi, Trust me on this: You can't "improve" your hearing. It is what you are born with, then it gets progressively worse as you get older. How worse depends on many things, but exposure to noise and your genes are the two biggest factors. Think of your hearing like a long hall rug. Noise is like people walking over the rug - over the years the rug becomes worn in certain areas of heavy use (usually the higher frequencies) and so you hear less well at those frequencies. This is called presbycusis, or age related hearing loss. However, noise related can strike you at any age and is caused by the very delicate hairs in the inner ear being damaged by a sound wave that is too loud for them. Imagine 100 people having a party on that rug! The ear tries to ameliorate this by constricting the muscles and tiny bones that form your inner ear so that loud noise can't get through, but sudden noise like a gunshot happens too fast for the ear to protect itself, and prolonged loud noise also gets through as the ear can't remain "scrunched up" for very long. If you've ever come away from a rock concert with your ears ringing, then that is evidence you have damaged your hearing. This is sometimes called an industrial injury, as it afflicts many in occupations such as gunners, drill operators, or indeed rock stars. I once treated the Manager of Status Quo for his noise induced hearing loss (too many loud concerts) and the lead singer of The Who wears a hearing aid. This is also what you get if you use ear phones turned up too loud. However, usually the ear will recover from short term loudness - but not prolonged or frequent exposure. Once it's gone, it's gone, and can be replaced by a very annoying ringing in the ears called tinnitus, for which there's no cure.
Your test isn't really good enough to judge your hearing, but your parents would have known at birth if you had a problem, so you probably don't - yet. You will probably still hear OK into your 80's - depending on the above genes or exposure - and your hearing is average for a teenager. Just make sure you keep it that way!
So basically, turn down your earphones!