mixing old and new components

first off, I'm a novice when it comes to high end stereo equipment. My current 'system' is a combination of new components and my father's cast-offs. I have a Yamaha RX950, a Rotel RCD 1070 and B&W CDM7nt speakers now.

I just inherited his entire system which includes Aerial 10T speakers, an Audio Research line stage amp (LS10), a Creek DA-60 and CD-60 and 2 McCormack DNA-1s.

Is it recommended to mix old and new, such as using the B&W speakers with the inherited components listed immediately above?
Thanks