Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said: "When it is the thirty-fifth year, a tremendous matter will occur. If they perish, that would not be unlikely, and if they are saved, then there is hope. And when it is the seventieth year, you will see things that you will find objectionable."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 8826