I remember reading research, probably done in the U.S., that mothers do not develop a fully mature parenting style until they are 28. Mothers over 28 tend to have more empathy and are more reasonable in their expectations for children.  An adult brain is not fully developed until they are 25.    

I am a therapist who works with many children and their parents.  Some people are more mature than others and can make good parents by the time they are in their early 20s.  I honestly have never seen an adolescent that is able to sacrifice their own needs for a child in a way that a more mature parents can.  think that parents who have children too young tend to be better parents for their younger children instead of for their first children.   If you really want children you might make good parents, but probably not as good of parents as you could be if you wait longer. 

P.S. That difference in brain development that occurs between 18 and 25 is primarily about impulse control and emotional management.  Young children can do things that are incredibly frustrating and anxiety provoking.  Those few extra years of brain development for increasing impulse control can make a difference in being able to respond well instead of react impulsively and emotionally.   Of course the other side is that parents who are too old do not have as much energy as younger parents, so if the ¨sweet spot¨ is lets say, between 28 and 35, maybe it makes sense to start having the first children before 28 and have the time when you have more than one young child at home be more with that ideal range.  It is possible that different cultures make the ideal age different as well.

¡Hola!

Me parece que es demasiado pronto. Sin embargo, todo depende de la cultura. En mi país es algo normal casarse muy jóvenes.