Thyroid diseases rank second among endocrine disorders, and prevalence of the diseases is higher in the elderly as compared to the younger population. An excess or deficiency of chemical element contents in thyroid play important role in goitro- and carcinogenesis of gland. The correlations with age of the twenty chemical element (ChE), including I, and I/ChE content ratios, as well as inter-thyroidal relationships between ChE contents and I/ChE content ratios in normal thyroid of 73 males (mean age 37.3 years, range 2.0-80) was investigated by two methods: instrumental neutron activation analysis and inductively coupled plasma atomic emission spectrometry. Our data reveal that the I and Ca contents, as well as I/B, I/K, I/Li, I/Mg, I/Mn, and I/P content ratios increase, while Al, B, Ba, K, Li, Mn, and P decrease in the normal thyroid of male during a lifespan. Therefore, a goitrogenic and tumorogenic effect of excessive I and Ca level and inadequate Al, B, Ba, K, Li, Mn, and P level in the thyroid of old males, as well as a disturbance in intrathyroidal I/B, I/K, I/Li, I/Mg, I/Mn, and I/P relationships with increasing age may be assumed. Furthermore, it was found that the levels of Al, B, Ba, Br, Ca, Cl, Cu, Fe, K, Li, Mg, Mn, Na, P, S, Si, Sr, V, and Zn in the thyroid gland are interconnected and depend on the content of I in it. Because I plays a decisive role in the function of the thyroid gland, the data obtained allow us to conclude that, along with I, such ChE as Al, B, Ba, Br, Ca, Cl, Cu, Fe, K, Li, Mg, Mn, Na, P, S, Si, Sr, V, and Zn, if not directly, then indirectly, are involved in the process of thyroid hormone synthesis.