Account vintage with existing banker refers to length of the borrower’s relationship with the current or previous bank. Higher vintage with satisfactory conduct improves comfort on repayment discipline and stability. Define the unit clearly, usually months or years. In MSME credit workflows, it mainly supports clean account mapping, workflow routing, audit trails, reporting and post-disbursement servicing rather than acting as a standalone credit-strength indicator. For example, if the value is captured incorrectly in the loan-origination system, approvals, account mapping, reporting or customer servicing may later fail even when the credit decision is sound. It matters because the credit, operations and monitoring teams must all work from the same borrower, facility and account record. The common mistake is to treat it casually as a back-office field; wrong, duplicate or unmasked data can create privacy risk, reconciliation errors and avoidable rework.