the house is about 20 years old and from the well the pressure is fantastick but once it is run through the house the pressure is lost ALL OVER there is no one spot that is better than another
Is it do to mineral build up in the copper, and do the 90s having the most blockage? if it is how do i propperly clean them?
If it is not then what else
First off I think you are confusing the pressure you are seeing at the pump with the volume of water that is coming out of the taps. If you have 60 psi at the pump and the expansion tank, you will have 60 psi at the taps, (minus a very small amount for the restrictions of the pipe and fittings) but volume is a separate issue.
I have seen this problem many times and most of the issues involve a ruptured bladder in the expansion tank, not enough air in the tank or an undersized tank.
Copper piping is not prone to collecting scale buildup but if you have any galvanized piping anywhere in the system, including small nipples or even a few fittings, this can also cause a restriction in volume. (not pressure)