Best Time To Buy An Audio Receiver If I Buy A 1080p Blu-ray Player What Would Be The Dis-advantage To Using My 5 Yr Old Audio Receiver?

If I buy a 1080p blu-ray player what would be the dis-advantage to using my 5 yr old audio receiver? - best time to buy an audio receiver

I see new versions receiver 1080p now, why should it matter if it comes to audio?