Oldest TV in the house (but in storage) is a 1985 Sony 13" kitchen TV. Stereo decoder & speakers, RCA composite A/V input, RCA audio pre-out, on-screen display, full-range cable & antenna tuners built-in, full remote control, and even supports the same discrete power and input commands in use today. Brilliant piece of engineering for the time. Also cost $800 back then.

My primary TV is a Pioneer PRO-150, which is no spring chicken any more. Probably the oldest in-use TV is a 23" Sony kitchen LCD... 2005 era. Can't even buy them this small any longer. Thankfully, it has HDMI and properly functional HDCP.