Do not touch Alchahol, or any other intoxicant, don't smoke and please watch out for some blood pressure tablets that cause a cough.
Do not shout your head off like some rock singers, or artificially stretch your range like art singers are taught to do and you will be fine into older age as McColl, Tawney, Burland, Wyndham Read, Steve Turner Pete Coe (forgive the smoking) and yours truly have proved.