Most millennials have invested heavily in stocks or cryptocurrency — and that hasn't turned out so well. As many younger investors bail out of those investments, bonds may not look so boring anymore. Treasury bonds, backed by the U.S. government, are a lower-risk option, offering returns now that many investors may find very attractive. Yet younger investors have been closing investing accounts, making them heavy sellers over the past year — more so than any other generation. A recent survey by Ally Financial finds nearly half of millennials, or 49%, sold all or some of their investments in the 12 months through August.

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