The validity of old passport is until November 24,2015. So you can renew before that but if you are travelling outside US (not Nepal) many countries have requirement that your passport be valid for six months. So in our case, if you do not have new passport after May 24 which is less than six months from the deadline of Nov 24, you might get difficulty for travel. If you are travelling to Nepal, it should be fine but make sure you dont stay in foreign country like Dubai, qatar. If you r staying there , they wont allow you if you donot have valid passort that expires in six month. Also, when you apply for passport, your form size,margin and photo requirenments are must