Two 81-year-olds from Texas are midway through traveling the world in 80 days.   Best friends Sandy Hazelip and Ellie Hamby are now in Egypt and nearly 50 days through their journey across the world, which will see them visit a total of 18 countries and seven continents.  Since departing Dallas on January 11 the two crossed the Drake Passage to Antarctica, and have visited many exotic locales including Easter Island, the North Pole, Argentina, London and Zambia. Before they left, they set themselves guidelines: Avoid first class travel, stay in small hotels, carry just one small bag, no tours, use public transport and don’t hire travel agents. Sandy Hazelip (right) and…