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I used them based on an earlier recommendation on the boards. I bought, I think it was 5,000 names. There were over 25 that were younger than 50. My list was supposed to be 67-75. The names were right, but the ages and incomes were WAY off. I understand that often the income levels are an unknown and a guess, but the ages should not have been that far off. This was quite useless when talking about Medicare Supplements, of course.
I have never had trouble with USAData, though, in this area.
Age data comes in many shapes and forms and data quality varies greatly by state.
Exact age information contains month and year of birth and is matched at an individual level. These data work the best, but the cost is also the highest, and coverage is spotty. The primary source was drivers license data which was sold by 35 states in the past. If you are marketing to a state that did sell these data you might have good coverage.
Exact age information with year of birth only is also common, but less useful for T65 because you can't time your communications near the correct month. It is lower in cost than age data with the month.
Modeled age provides the best overall coverage, but comes in ranges and is pure guesswork. This has the lowest cost.