i bought a new laptop last thursday and have ran cinebench 11.5 numerous times and the longer i have it the better the cpu score gets. it has came from a 3.8 ish to now a 4.75 and when i tested it the first day it consistently would test in the 3.8's and each successive day the results would be consistent. is the normal for a cpu to become better and better as it ages to a point at least?
Probably some driver updates and windows updates, if stuff is trying to use the CPU while you are trying to run the benchmark you will end up with variable scores, the first day or two a new system is usually slowly acquiring an update and not settled in.
A CPU does not age, its a crystalline assembly and as long as the temps arent getting super high there is no change in its physical state so its not possible to break a CPU in.