We still use a CRT television
as our main set but it's only 15 years old, fits nicely into where we want it and it still works fine. As devices no longer have SCART outputs we may need to change at some point but it seems that anything with a good picture and sound is going to be huge (comparatively). Ours is 28" and that's OK, good speakers too.
Really can't see point in changing stuff unless really need to - dishwasher and gas oven are both 15 years old and work fine (I can't use induction stove), washing machine is 22 years old. (It's a great way to get rid of the appliance cover sales folk with great offers to cover appliances - tell them how old your stuff is they go away).