Everyone loses the ability to hear the higher frequencies as they age. By age 60, most can only hear up to about 12 KHz, instead of the 18-20 or more when they're very young.But it's hardly noticeable. (actually, can be an advantage!!)
I think it's unusual to lose low freequencies, possibly because that part of the hearing mechanism is more robust.
Damage by industrial noise or infections and the like can be severe for those unfortunate enough to have suffered it.
However, it should be realised that, unless profoundly deaf, picking out the beat of music can be done nearly all the time, even without low and high frequencies.

"I asked a simle question. i did not ask for a snide answer. How can i backlead a CD. or an orchestra which is playing"

You can't, obviously. But that doesn't stop people from trying.

Just because your lips say "one" doesn't mean it's actually beat.

Find a dancer who is off time, and there's a better than even chance that they are counting - but counting off time from the music. In other words, they are with their counter attempting to impose their idea of what the music should be, on musicians who obviously can't take that into consideration, having already done their job and commitited the results to posterity.