"My father is 95 years old except that he's dead." Is this a nonsensical thing to say?
No. Death is an entirely effective bar to aging: you can't age if you are dead. But you can get older. The sentence sounds like nonsense or a joke because we tend to conflate aging with getting older. That they are different is clear from the fact that some of us age faster than others while we all get older at the same rate.