Yes, If it is financially possible to do any Electrical Service. This should be on your priority list. Aluminum wiring eventually causes shorts and have the potential to cause a fire hazard.
We convert aluminum to copper with special connection devices in device boxes. These connection devices are rated for this type of conversion.
No, although you may have aluminum throughout your home. Conversion can be achieved at device boxes. If you choose to, you can rewire entire home , but is not needed unless circuits are broken inside walls of your home.