At what age do americans generaly marry ?

My guess would be late 20's, early 30s. I don't think many 20 somethings take it seriously. They're either too picky or expect a fairy tale. Marriage, even the best marriages, are nowhere near a fairy tale.

Twenty-five.   

extract.
INSIDER's Data team compiled data from the U.S. Census Bureau to see men and women's average age when they first wed in every state. We found that the average age around the US that people get married hovers between 25 and 30 years old. Additionally, in almost every state men get married slightly later in life than women.

Take a closer look at how the average age of marriage differs from state to state. 
https://www.insider.com/when-people-get-married-every-state-2019-1

No age limit by law

Everyone is different. There are many different factors to consider individually. 

It depends on the person.

About 20 years too early, on average

between 25 and 40, still young at 40, if you like to get married let me know, lol

Laremi, I'd say the current average is 25-35.

Generally between sixteen and eighty.