Both of these would be the correct way to get the contents of column 3:
input @3 age 1.;
input age 3;
This also takes the contents of column 3:
input @25 age 3;
It essentially says, "Move to column 25. Then get the contents of age from column 3."
Since column 3 contains a slash (part of the date), the AGE values are missing.
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