Definition and synonyms of poor from the online English dictionary from Macmillan Publishers Limited.
See IRS Publication 552, Recordkeeping for Individuals, for more information. Six Years. If you may have under-reported income by 25 percent or more, then you'll need to keep tax returns and all related information for six years.
And since you must keep tax-related records for 7 years, you potentially should keep them for that long. Reference the related link below. Since you can only dispute a charge within the first 60 to 90 days of it being entered then it is generally safe to discard statements after the 90 day period for dispute has expired.