I think too, it will also depend on what's happening in your family at the time.
Andrew is 'subjected' to way more than Matthew ever was at the same age. When he was 3.5 Matthew would watch Shrek, Madagascar and cars. But only at weekend and he'd see half on Saturday and then the rest on Sunday. Now though, Matthew is old enough to see a whole thing from start to finish in one go and gets the plot etc, but he's 7 and he and Daddy will relax together - so cute both cuddled up on the sofa. The knock on effect is that Andrew now often sees a whole movie as opposed to half - he is free to wander off at any point and often does but he won't accept being taken away if Matthew is still watching KWIM.
I am struggling with finding appropriate TV for both of them. Its wet and miserable outside, its the holidays, we do arty stuff, we do playdough, lego, they have the train set out, we read, we play games so balanced in other creative and imaginary stuff. Matthew doesn't want to watch Thomas the tank engine - he wants scooby doo. So, they both end up watching both - not good for Andrew watching Scooby - but not sure what to do
So, we do watch movies instead that both are interested in - but theres a limit on how many times we can watch some
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Alex