We determined the age dependent prevalence and frequency of BCL2/IgH rearrangements in 715 healthy individuals ranging from newborns to octo- and nonagenarians.     ///    The mean frequency of BCL2/IgH junctions in healthy individuals > or =40 years (18-26 x 10(-6)) was significantly higher than in younger subjects (7-9 x 10(-6)).     ///    "In the age groups representing 10-50 years old, we found a steady elevation in the prevalence of BCL2/IgH junctions up to a prevalence of 66%. "    ///    The overall prevalence of BCL2/IgH junctions in this large sample was 46% (327/715). 