stage of old age

基本解释

The same as our stage of life. All of us need experience juvenile, youth, middle-age finally verging upon the old-age.
正如人的生命历程一样，我们都要经历少年，青年，中年，老年；
Only tumours, which admittedly represent the final stage of degeneration in old age, are always immediately referred for surgery.
只有公认的呈现老年恶化晚期肿瘤才总要立刻进行外科手术。
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Cynoglussus abbreviatus of 1~4 years old are on the growing stage with the fastest growing speed at the age of 1~2, it being gradually getting slow after 2 years old .
结果表明：1-4龄的短吻舌鳎处于生长期，在生长速度上，1-2龄生长速度最快，以后生长速度逐渐减慢；