Greed knows no bounds

जीर्यन्ति जीर्यतः केशाः
दन्ता जीर्यन्ति जीर्यतः ।
चक्षुःश्रोत्रे च जीर्येते
तृष्णैका तु न जीर्यते ॥

- महाभारतम्

As a person gets older, the hairs get whitened and fall out while the teeth lose their strength and wear out. The eyes and ears too get weaker. Despite all this, the greed of a person is not satisfied and never decreases with age.

Greed knows no bounds.
Age is no guarantee of maturity.
Wisdom doesn't necessarily come with age.