First LCD TV I bought in ~2004 (a 32" 1080p Sceptre for $400) is still in use in my daughters room. Was our bedroom TV till a few months ago.
It was replaced with a Phillips 42" 1080p that I found by a dumpster. From what I can find, it is from around 2007-2008 time frame. No idea why it was in the trash, it works fine and looks good to me.
Living room tv is a 46" 1080p RCA that I bought for $400 in 2006/2007?
I don't understand why people buy a new tv when their old one still works? My sister (actually her husband) buys a new TV every other year or so, always getting a bigger/better/more featured model.
I watch stuff on theirs, and really see no difference to justify upgrading mine. I just don't need a 70" 4k smart tv.