High fidelity or hi-fi refers to the reproduction of sound and image that is very faithful to the original. That is without noticeable amount of noise and distortion.
... 45 to 64, and 12.7% who are 65 years of age or older. The median age is 39 years. For every 100 females there are 104.2 males. For every 100 females age 18 and over, ...