One fact that has emerged from the past several decades of aging research is that aging is not simple. The work that my colleagues and I have done on Drosophila longevity bears this out. We reported that aging in our Ra strain of wild-type flies is rather complex, being characterized by at least three different extended longevity phenotypes, each of which was induced by specific stimuli and had different demographic mortality and survival profiles (Arking et al., 2002). As shown in Figure 25.1A, the first longevity phenotype (Type 1) is a delayed onset of senescence that leads to a significant increase in both mean and maximum life span of the experimental strain.
1Adapted from Chapter 7 of book by Arking (2005a).
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