I ought to explain my remark better.
I'm a westerner who has been married before - twice, in fact, so either
(a) - I am the last person who should be offering advice
or
(b) I am the ideal person, because of my wealth of experience !
Years ago, I took a job as a manager in a state owned enterprise in Beijing, in the early stages of China's "opening up", at a time when, if you were a Caucasian, children and grandmothers would come up and try to see if you were really human. People were very, very "different" indeed. But it dawned on me that the way to understand them was to assume that we are all the same, and that the important thing was to know where somebody was "coming from" if I wanted to know why they behaved as they did.
In the years since, that has struck me as one of my better ideas. It has completely stopped me from feeling scared of foreigners and of strange places. Instead, I just try to work out why people are doing what they do.
Of course, this is just a variation on the old idea of "walking a mile in the other person's shoes", but it did strke me very strongly at the time and it has helped me since, so I pass it on.
Now, getting back to the subject at hand, we know where we are "coming from" - gWaPito sums it up beautifully - so where is a Filipina who falls for an older foreigner "coming from"?
The Philippines is a very, very "macho" culture. To start with, to become a man in Filipino society, a teenager must be circumcised, without anaesthetic, without showing fear or pain. Manliness is very much a prized virtue.
The Spanish and American influences on Filipino culture have only added to this. They are both "macho" societies.
Boys are always indulged by their mothers, whilst little girls are made to help with housework and so on from a very early age and are taught to behave in a feminine, demure, way*.
This leads to some interesting complications - to quote my sister in law, the reason you must always fold a bill into your driving licence, when a traffic cop pulls you over in the Philippines, is because being a traffic cop is a "macho" job, so, to show he is "macho" enough, a traffic cop must have a wife and children
and a mistress and children, but his salary is not enough for that, so he must add to it... it is your business, as wealthy car driver, to help him with a pasalubong.
We therefore have a culture in which the married man is very often tempted to stray, and this is not helped by what I think of as almost the national sport of some Filipinas, which is "romantic love" (in no other country is Valentine's day talen so seriously, and see endless trashy novels aimed at and read by women, romantic films, etc) and this leads some women to think that their idea of fun should be encouraging the men to stray..
Now, the Philippines is a poor place, and contraception (see other threads!) is not readily available, so our macho Filipino may well find that he is unable to provide for his wife and kids as well as he feels he ought to. Drink and indeed drugs are readily available - both cheap... so some men take refuge in those.
The result is that some women see Filipino men of their own age as unreliable - theyare altogether too full of testosterone - they may chase other women, they may drink or take drugs and marital abuse is all too common.
From that point of view, an older foreigner can look pretty attractive. He won't get drunk chase other women or beat you and he probably has a relatively secure source of income. Furthermore, women are treated better in western societies.
But it doesnt mean that the lady is fundamentally different because she is Asian; it means that she is making a rational choice, coming from a different place. Fundamentally, she is the same. She isn't "hard wired" to prefer older men; she just thinks that for her, an older, foreign, man may be a better option. And that is not to say that she won't fall in love with him; it just means that she is starting from a different place. Where you both end up is up to you.
* I'd say this is starting to change, amongst twentysomethings in the middle and lower middle classes, now, just as it changed in Japan, a few years back, but the process is gradual.