I do update our Lounge room every 2 years.I keep the main items, but I like to have a new lamp shade, as they tend to look tired.
Rugs are changed, and any cushions....and of course curtains too.Just so the place looks fresh, and also may paint ever 4-5 years.
I hate that live-in-look, where it all feels like if you sit down....something may
just 'bite-you'! yuck.