middle aged stage 15.0 30.0 7.0 true Late adult stage that refers to a mouse which is over 7 and under 15 months old. mouse_developmental_stage MmusDv:0000075 This stage is commonly considered in the literature as the stage during which first evidence of loss of functional capability like hearing occurs in wild type mouse strain (see http://www.ncbi.nlm.nih.gov/pubmed/18259074). 7-month-old stage 8-month-old stage 9-month-old stage middle aged stage