Beyond a certain age

I think I've passed some mystical milestone of age without noticing it.
It revolves around a conversation with a person less than half my age.

It was about my TV.

Him: You have an HD media box.
Me: Yes.
Him: But your TV is only 720p
Me: I'm not bothered, the picture is good enough.
Him: But all your HD films will look about the same as SD ones!
Me: Yes, and? They all look good to me.
Him: But if you had a 1080p Tv you would see that your SD movies are
worse to look at.
Me: So if I spend three times as much on a new TV I can see a picture
that I wouldn't enjoy instead of being happy with the one I have?
Him: <gibbering rage>