Serum samples from healthy subjects of different ages (within the age range 1-75 years) were tested for the presence of antielastin IgG, IgM, IgA and IgD by an enzyme-linked immunosorbent assay, utilizing insoluble human aortic elastin. All the tested sera showed detectable levels of antielastin antibodies of the four classes with the following regularities in changing their level with age. Antielastin IgG and IgM showed relatively high levels in the serum of children, growing even higher in the serum of subjects 18-20 years old. Then their levels were stabilized in the serum of 30-60 year olds for IgG and of subjects 30-50 years old for IgM and gradually decreased thereafter. The antielastin IgA showed non-significant changes with age up to the age of 40 and then its level gradually increased. The antielastin IgD showed statistically non-significant changes with age and a tendency to decrease after the age of 60.