law HM

Helen, age seventeen, wanted to buy a motorcycle.  She did not have the money to pay cash but persuaded the dealer to sell a cycle to her on credit.  He did so partly because she said that she was twenty-two.  Helen drove the motorcycle away.  A few days later she damaged it and then returned it to the dealer and stated that she avoided the contract because she was a minor.  The dealer said that she could not do so because (a) she had misrepresented her age and (b) the motorcycle was damaged.  Can she avoid the contract?  Answer each issue separately and support your answer with the law.