In our modern society, people tend to marry around early thirties or late. However, I personally believe that this trend is a wholly positive development.
To begin with, people today enjoy their lives and keen to have more life experiences before they are ready to be married. Marriage, in fact, demands a lot of efforts and patience to make it work happily in my view. Especially for women, once they have a child, they are no longer free and totally committed to their family, therefore, they tend to enjoy their life as much as they can before they start a family.
Another beneficial point to marry around thirty is that people usually become more mature mentally. The longer people live, the more people learn how to be patient that is most needed when become a parent. Although I concede the risk that mature women sometimes face in the course of their pregnancy, I would argue that the medical system now is very developed to treat the women and babies' health.
Finally, my strongest argument is that the financial aspect. People around thirty years old, in my opinion, are more likely to have enough career and savings to feed their family. The more affluent the parents are, the more opportunities children can have. Education, for instance, costs a fortune in many countries and some children from low-income family often give up on learning in higher academic institutes that can be avoided by parents who have more budget to rear children.
To sum up, not only waiting until thirty and marry gives time to enjoy their life, but it also makes the parents be more affordable for children's education in the future. Therefore, I believe that the trend is absolutely a positive development. 
In our modern society,  
people
 tend to marry around early thirties or late.  
However
, I  
personally
 believe that this trend is a wholly  
positive
 development.
To  
begin
 with,  
people
  today
 enjoy their  
lives
 and keen to have more life experiences  
before
 they are ready to  
be married
. Marriage, in fact, demands  
a lot of
 efforts and patience to  
make
 it work  
happily
 in my view.  
Especially
 for women, once they have a child, they are no longer free and  
totally
 committed to their family,  
therefore
, they tend to enjoy their life as much as they can  
before
 they  
start
 a family.
Another beneficial point to marry around thirty is that  
people
  usually
 become more mature mentally. The longer  
people
  live
, the more  
people
 learn how to be patient  
that is
 most needed when become a  
parent
. Although I concede the  
risk
 that mature women  
sometimes
 face in the course of their pregnancy, I would argue that the medical system  
now
 is  
very
 developed to treat the women and babies' health. 
Finally
, my strongest argument is that the financial aspect.  
People
 around thirty years  
old
, in my opinion, are more likely to have  
enough
 career and savings to feed their family. The more affluent the  
parents
 are, the more opportunities children can have. Education,  
for instance
, costs a fortune in  
many
 countries and  
some
 children from low-income family  
often
 give up on learning in higher academic institutes that can  
be avoided
 by  
parents
 who have more budget to rear children.
To sum up, not  
only
 waiting until thirty and marry gives time to enjoy their life,  
but
 it  
also
  makes
 the  
parents
 be more affordable for children's education in the future.  
Therefore
, I believe that the trend is  
absolutely
 a  
positive
 development.