Charak Samhita
आयुषःप्रमाणज्ञानहेतोःपुनरिन्द्रियेषु] जातिसूत्रीयेचलक्षणान्युपदेक्ष्यन्ते ॥१२४॥
॥ Knowledge of lifespan॥ In regard to knowledge of measure of life span, there is description of symptoms in Indriya sthana and Jatisutriya adhyaya (eighth chapter of sharira sthana).
english translation
AyuSaHpramANajJAnahetoHpunarindriyeSu] jAtisUtrIyecalakSaNAnyupadekSyante ॥124॥
hk transliteration by Sanscript