Aaron has entered into a contract with Wilson, a man who is elderly and suffers from dementia and was unable to understand the nature of the contract he was signing. Wilson had not been legally declared to be incompetent at the time the contract was signed. It was an agreement for Aaron to mow Wilson's lawn each week in consideration of $50, which is a fair price for the service. Aaron was not aware that Wilson had dementia. What is the legal status of this agreement? It is a voldable contract. It is a unilateral contract It is a void contract It is a valid contract