"Fighting age males" common, you actually believe that those people are invaders coming to fight? That's sad, you need some doctor to cure this paranoia of yours.
I guess it's a safe bet to say your family wasn't born where you live now. Some people had to migrate to the country you're in just to earn a living and have a decent life. That's what most people want. They want TV, get fat in front of the superball.
Anyway, to feed a little this discussion, according to the UNHCR, in Greece, more 60% men are crossing the border. In the mediterreanen however, 72% men. More men than women ideed. Does this mean they are coming to fight? not really. Usually young men come first because:
1-migrating is hard and dangerous. So you might as well risk your own life and not that of your family.
2-If you don't have a family it's easier to travel (duh!)
3-Many times, men come first, get a job, try to get legal papers, and then try to get their families to come over.