Consumer magazine do a guide on estimated life of appliances, last time I saw one TV's were the 10 year mark.
They may have updated it since I saw it, but with the lack of any other independent guide this is the measuring stick
Telling people how long something should last is close to impossible. You need to factor in on-going trends of cost cutting in factories, the on-going market strategy by these companies, ie 'we want products to be cycled every so many years' etc.
Fridges should last 15 years!
TV's should last a decade!
Cars should last 12 years!
Mono-block audiophile valve amplifiers should last 7.38 years!
It's subjective, Consumer Magazine is here to give you and I (the consumer) the best news.
It's one of the ways they sell subscriptions...
Fairly warned are yee.