The marriage rate in America has dropped to an all-time low, according to a new study by the Pew Research Center.Researchers found that just 51 percent of all adults have tied the knot.

In 1960, 72 percent of people age 18 and over were married. Today, it's only 51 percent , dropping 5 percent from 2009 to 2010.

Researchers suggest one reason for last year's sharp decline could be the poor economy. They also noted the following:

• More people are living together.
       
• There are more single parents.
       
• People are waiting longer to get married.

Most women are now around 26 years old when they tie the knot, while most men are almost 29.