Thank you in advance for your suggestions and guidance. Savings bonds stop paying interest when they reach their final maturity. Older savings bonds had an original maturity and then an extended maturity period. The section on EE/E bonds' rates and terms on the TreasuryDirect website explains the maturities and interest rates for Series EE/E savings bonds. Series I bonds mature 30 years after their issue date.I'd suggest inputting the children's savings bond portfolios into TreasuryDirect's Savings Bond Wizard.