ṣaśatāyuṣaḥ

 The Sanskrit term ṣaśatāyuṣaḥ is a compound word 

composed of two primary elements:

ṣaśata (षशत) – meaning "hundred" or "century."

āyuṣaḥ (आयुषः)– derived from āyuḥ (आयुः), meaning "life," "lifespan," 

or "duration of life."

Analytical Breakdown:

• ṣaśata = 100
• āyuṣaḥ = of life or having life
• When combined in classical Sanskrit (Sandhi rules applied), 
• the compound ṣaśatāyuṣaḥ literally translates to:

“one who has a lifespan of a hundred years” or, more generally, 

“centenarian”.

Contextual Usage:

In ancient Sanskrit literature, including Vedic and later texts, such 

a term is often used as:

• A blessing or benediction: wishing someone a long life of a hundred 
• years.
• Descriptive of exceptionally aged individuals: describing someone 
• who has reached or is expected to reach a century of life.

Grammatical Note:

• Formation: This is a tatpuruṣa compound, where the first 
• element (ṣaśata) qualifies the second element (āyuṣaḥ), i.e., 
• "hundred-life."
• Declension: Being a masculine nominal compound, it will 
• decline according to standard masculine noun endings in 
• Sanskrit.

Summary:

$\boxed{{\displaystyle \text{ṣa}\acute{\text{s}}\text{at}\bar{\text{a}}\text{yuṣaḥ = “one whose life span is 100 years; a centenarian”}}}$

This term exemplifies the rich descriptive power of Sanskrit 

compounds, encapsulating both numeric and existential 

information in a single word.