It is determines only "age". It is possible a human live 20 or 200 years. It is relevant with number of breaths. For living up to infinitive, you need to stop your breaths. There is no other way and this way is fact.
Yes, a baseless, arbitrary indication of "age", not your officially recognised age, nor your biological age.
No. The number of breaths doesn't determine how long you live. We have already pointed out why it is pure bullshit. If you wish to keep claiming it you will need to prove it.
And no, if you stop breathing, you die.
There is no way to live forever. Not unless you can stop the heat death of the universe.