开始衰老 meaning in English

senesce

As a man ages he is subject to several conditions that can affect his mortality
当一个人开始衰老，他就面对数个可能影响他老死的因素。
The minute a man ceases to grow - no matter what his years - that minute he begins to be old . on the other hand , the really great man never grows old
一个人一旦停止成长- -不管他年龄多大- -他就开始衰老。反之，真正的伟人从来不会衰老。
6 . there are very close relations between the rapidly decreasing of the soluble protein content , the sweetly enhancing of ep activities , the quckly increasing of fre
切花瓶插期间，花瓣、叶片中可溶性蛋白质含量迅速降低、内肽酶活性迅速增强、游离氨基酸含量迅速升高与切花衰老密切相关，可以作为切花开始衰老的生理指标。
The experiment materials were sd rats . according to their developmental characteristics , we selected six groups of rats : postnatal 1 day , postnatal 3 weeks , postnatal 3 months , postnatal 12 months , postnatal 18 months and postnatal 24 months . each group included 30 rats . the results of the experiments were analyzed with the software of stat on computer
本研究以sd大鼠为实验材料，按照其生长发育的特点分为：初生组(生后1天) 、 3周龄组(离乳期) 、 3月龄组(成年期) 、 12月龄组(开始衰老) 、 18月龄组(衰老期)和24月龄(衰老期)六组，每组30只大鼠，实验结果进行统计分析。