Who cares what age differences there are between a couple, it's just a number, aesthetically it might look different to what you would normally be looking at back home.
The above said, to some it would be no different to looking at a gay couple, male or female or a Ladyboy so to speak.
What one has to remember here is one word, i.e. "acceptance", the world we live in is f-ck-d up, if a couple for example have years apart from each other, as long as they have respect for one and other and are prepared to support each other, regardless if it's from a monetary or emotional prospective, personally I don't give a sheet, as long as their lives are happy and better, then kudos to them.
For the record, there is 21 years the difference between me and the wife, do we care what people think, if you think we do, you are so wrong.