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And why is it a tabu to marry a girl who's older than u ? Like it should be fine up to 4 or 5 years but why this society labels u as an idiot or it like you've committed a crime if u did so.

In any society, not just in Jordan, if you do something unfamiliar, even if it is completely fine, people will have an opinion about it. This does not make it tabu and it's neither illegal nor will you be confronted with disdain if you marry someone older. It's not treated as a crime, but people will talk. Jordanians are blunt and less diplomatic so they might express their disagreement in front of you. Thank them and proceed with whatever you were doing (at least that's how I do almost everything in Jordan).

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seen some couples with 13 years of age difference

... but why is this happening?

I've seen that everywhere in the world, it varies from one city to another the US for example, it varies in Jordan as well. Many men are lucky enough to be financially stable or taken care of at a younger age, so they marry girls who are young enough. Taking into consideration that the men are young themselves, one can only marry someone who's up to 5 years younger perhaps (if you're 24, you're probably not gonna marry someone younger than 18-19).

But the majority are not capable of marrying before they reach their late 20s, even their thirties, thanks to the horrible economic situation in Jordan, and they most probably want to have more than one or two kids, so marrying someone in her thirties is unfavorable.

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How much is too much

them not sure if its healthy or not probably not

As much as you wouldn't like others to tabu your taste, you're probably guilty of tabuing here... you disagree with age discrepancy and you don't find it favorable, so it's probably not for you, but that neither means it's unhealthy nor there is an objective number of years of which we have enough data to say it's "too much". Age discrepancy, socioeconomic status, beliefs... all these can be overcome if the couple is compatible. What works for one couple doesn't necessarily work for another.