Charak Samhita
रसायनमिदं ब्राह्ममायुष्कामः प्रयोजयेत्। दीर्घमायुर्वयश्चाग्र्यं कामांश्चेष्टान् समश्नुते ॥५७॥
An individual desirous of longevity should use this Brahma rasayana by which he attains long life, excellent (youthful) age and wellness.
english translation
rasAyanamidaM brAhmamAyuSkAmaH prayojayet। dIrghamAyurvayazcAgryaM kAmAMzceSTAn samaznute ॥57॥
hk transliteration by Sanscript