I think online I saw before it averages around 5 years for well used areas like hallways, and 10-12 years for rooms like bedrooms
This sounds about right to me. I can’t imagine decorating every couple of years! I always use colour (hate white walls) which I think lasts longer than white. My mums place is all white and it doesn’t take long for it to look grubby.
I’m in my 50s and and don’t really intend replacing much furniture now in my lifetime! I don’t buy for fashion, I buy things I love and want to keep. I had a pine dresser I loved but it was looking dated, so I just painted it and put on new handles and it looks totally different.
I do think some people get too caught up in “trends” and wanting to impress.