If they are redeemed before five years, the last three months' worth of interest is forfeited, but after five years, they can be redeemed with no penalty.
If you define a US savings bonds maturity as when you can gain the most economic value from redeeming the bonds, then its 20 years after purchase for EE bonds.
1) You can cash in a US savings bonds without penalty after 5 years.
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The composite rate for Series I bonds issued from November 1, 2017, through April 30, 2018,.58.