English to Spanish Bus/Financial Accounting Statements of accounts

We are talking about the company's policy regarding bank reconciliations. The entire paragraph reads:

All reconciling items noted should be fully investigated. In particular statement lines should not be allowed to age for a period in excess of 14 days. Any older items should be aged and clearly highlighted.

But basically I want to know what does the word "age" means in this context in Spanish.

Regards,