Insurance on new construction vs older homes

[Pedro Florentino]

Hello everyone, 

I have a home that was build in 1929 and in great condition.  I live in Miami and insurance is extremely high.  I spoke with my agent and one of the reasons is that the house is an older house.  Considering the option of tear down and build a new house, I was wandering if there's an average percentage difference in insuring a new home vs an older house?