Statistics for 998 show that the three chronic diseases that pose the greatest threat to the health of Chinese people are ranked according to their incidence in the total population, followed by hepatitis B, arthritis and hypertension. Among them, the incidence of arthritis and hypertension The rate increases with age, and the incidence of hepatitis B in all ages is not significantly different. The average age of the Chinese population will increase significantly from 1998 to 2010 and gradually enter aging society. Based on the information provided by the stem, which of the following conclusions is most appropriate? ['By 2010, the highest incidence will be arthritis.', 'By 2010, the highest incidence will remain hepatitis B.', 'The average age of hepatitis B patients will increase between 1998 and 2010.', 'By 2010, there will be more elderly patients with hepatitis B than non-elderly patients.']