A Friend borrowed $1500 on 10/2007...Can I sue since it has been 5 years? No attempt has been made by him to repay.. Can I sue?

It depends on where the contract, if any, was performed, or which state's law the contract specifies governs.  You should consult an attorney in the state where the contract's law governs, or agreement took place to determine if the statute of limitations has tolled, or if there are other issues barring you filing a lawsuit. This is not intended to be legal advice, and is general in its nature. No attorney-client relationship exists or is formed by this information. Furthermore, this does not represent the views or opinions of LexisNexis or its affiliated companies.