To me world peace cant be attained, currently. But time will surely come, it will be done.
How about you? Do you believe world peace will come?
No one know how this world in peaceful or when it will.
But I can say, peaceful start from ourselves, keep our mind in peaceful, doing things in positive way (like help more poor people, donate some of your money for poverty, share your time with family, talk and act in positively) than you will feel peaceful from your heart. Spread those feeling to your enviroment, than the entirely they will feel peaceful.