US Savings Bonds - maturity date

Do US Savings Bonds accrue interest after their maturity date?

In other words, suppose I bought a $100 savings bond tomorrow with a 50 year maturity date. Would the bond be worth more than $100 in year 60 or does it stay frozen?

Source: http://www.publicdebt.treas.gov/sav/sbfaqmat.htm

You can learn quite a bit at the US Savings Bond web site.