Account Reconciliation

can i clear unclear transactions in account reconciliation that are from prior year.  The years are from 1999 - 2009.  Back in 2011, they converted from QuickBooks to Sage 50 but no one cleared this transaction.  If I reconcile from March 31, 2014, my balances are good but want to make sure that these uncleared transactions do no affect and of the financial statements or accounts.