Very well written. Only one minor comment. You use the term "love marriage" and "arranged marriage" in a way that sometimes sounds slightly unnatural.
Here: " I think love marriage is better ", doesn't sound natural. However, what you mean is completely understood. Though admittedly I don't think there is a common term for what you mean by 'love marriage'. So I think that part would have to read like this:
"I think marriages based on love are better in many aspects. Here, I am not talking about the marriages that occur as a result of young age infatuation. I am talking about the marriages in mature relationships. In this type of marriage, we know our life partner beforehand..."
So, because there really isn't a phrase that means 'love marriage', you can see that in the first sentence I described what you meant. Further into the paragraph, I can refer to 'this type of marriage' because it is clear that I am referring to the original description of "marriages based on love'.
Next, in this sentence: "I think arranged marriage is a gamble." it should be "I think an arranged marriage is a gamble." or "I think arranged marriages are a gamble."
Again, everything was perfectly understood and well written, but I hope these minor suggestions help!