Stew is right about the first bit - this isn't just a movie about old people, it's really FOR old people.
As for his second assertion, I have to disagree: the acting (with the possible exceptions of Judi Dench and Bill Nighy) was at best creaky, and at worst downright amateurish; the storyline managed to drag AND be superficial at the same time, which is quite an achievement - and if you're looking for a film full of surprises, this ain't it. Even by the low, low standards of this genre, this film was predictable to an almost comical extent.
The script was largely poor, but with occasional spells of toe-curling awfulness. The scene where Judi Dench is teaching call-centre staff to talk to old people was almost unbelievably badly written, and as you can't make a silk purse out of a sow's ear, made even Dame Judi look bad.
The photography was nice and it did make me want to visit India but bearing in mind how much else is wrong with this film I'd be hard pressed to say that the direction was "average", let alone "outstanding".
Put me down for a great, big "meh", and that's being kind. It's borderline pish, and considering how many good things I'd heard about it, a big, big letdown.
I don't disagree that it is a movie for old people. When I saw it most of us were napping.