I see in my country many marriages at a young age and don't think about the economy in the future,
I know getting married at a young age is very beautiful,
but if the economy is insufficient, maybe should think again not to get married at a young age,
As far as I know people marry when they have the means to support themselves and not really about age or the general state of the economy.
and I think from that marriage it can give birth to children and increase the population of the earth, and maybe in a few years the earth will be full of humans and surely there will be many other crimes to survive on this earth,
Is there a solution, to overcome this impending disaster
Not sure what the disaster is here but business minded people will tell you that a country with a high population is a good place to establish a business, as this means a ready market for you so if this is where your country is going then prepare yourself and take advantage of the opportunity that's coming.