السلام عليكم ورحمة الله وبركاته Can Qadr be changed, even though it has been written for 50,000 years as in the Hadith.

If you are referring to the Hadith in regards to what returns the decree and increases your lifespan, what is meant is that it prevents this decree and brings the other decree. Allah (subhanahu wa ta'ala) has decreed for you: 1. If you have done so and so, then you get so and so. 2. If you don't do so and so, then you don't get so and so. So both are written for you.