The phrase "extended life span" is a correct and usable expression in written English.
You can use it when discussing a situation in which a person or organism's life span has been increased or lengthened. For example, "Medical advances have helped to extend the life span of many diseases."
If extended life span comes with prolonged frailty, or if enhanced altruism compromises survival skills, the overall value of the enhancement can be called into question (Shickle 2000).
However, on nutrient-rich diet, RICTOR mutants showed a profoundly extended life span, which is consistent with decreased consumption of nutrient-rich food by mutants (Soukas et al., 2009).
Among all individual herbs tested, only two herbs Panax ginseng root (GS) and Cinnamomum cassia bark (CIN) significantly extended life span in C. elegans (Table 3).
CIN in both SQDB and HLXL formula extended life span via modulation of multiple longevity assurance genes, including genes involved in insulin signaling and stress response pathways.
Administration of allopregnanolone solubilized in 2-hydroxypropyl-β-cyclodextrin (CD) to Npc1−/− mice at postnatal day 7 (P7) was reported to be beneficial, with treated mice exhibiting delayed clinical onset, extended life span, and reduced ganglioside accumulation.
Among all individual herbs tested, two herbs Cinnamomum cassia bark (Chinese pharmaceutical name: Cinnamomi Cortex, CIN) and Panax ginseng root (Chinese pharmaceutical name: Ginseng Radix, GS) significantly extended life span in C. elegans.
Second, deletion of mitochondrial superoxide dismutase (Sod-2) extended life span in Caenorhabditis elegans [ 17].
Furthermore, several agents including phenformin [ 11, 13] and its analog metformin extended life span in rodents [ 14- 18].
In normal genetically heterogeneous mice, rapamycin extended life span even when its administration was started later in life [ 11].
In C. elegans, elimination of reproduction by ablation of the germ line extended life span by up to +60% [ 6].
In fact, it has recently been demonstrated that mTORC1 inhibition by rapamycin extended life span in mice.
