HOLD ON TO THEM! Until they reach “maturity” and stop paying interest after 40 years. Those old savings bonds have high base rates, and still have an adjustable additional rate. Check their current value at www.TreasuryDirect.gov. But don’t be tempted to sell them yet. And remember, you will owe income taxes on the interest buildup over the years, so try to sell in a year when you know you will be in a lower tax bracket.