My HT system is also long in the tooth. But it still looks and sounds amazing. Watching tv/movies is still a pleasureable experience.
AVR: Denon AVR-2313CI
LCR Speakers: Def Tech SM55 and CS8040
Side speakers: Acoustic Research 215PS (on floor angled up wall like @ZeosPantera did in one of his HT videos)
Rear speakers: Polk T15
Sub: A Dayton Audio mutt, 15" driver, sealed box, 300 watt BASH amp
Display: Panasonic 60" 1080p plasma (a basic 2012 model, don’t remember number)
Sources: Roku Ultra, Sony Blu-Ray player (the one with the odd angular top), Steam Link,  a Chromecast, often I plug my Surface Pro 4 in via HDMI, and I have a Topping D10 feeding the AVR via optical as well.
Someday I hope to play with Dolby Atmos/DTS:X, but we are still renting so putting speakers in the ceiling is probably a no-go.