Rollovers into traditional IRAs occur evenly across all age groups and play a significant role in the growth of IRA assets, according to research by the Investment Company Institute and the Securities Industry and Financial Markets Association, released Thursday.

Each five-year age band from the 30-34 age group up to the 60-64 age group accounts for 10% to 13% of rollover occurrences. This relatively equal distribution reflects that rollovers occur across the full working career, not just at retirement, the ICI and SIFMA said.

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