Possible Clues:

• Declining stage
• Venetian leader receives thanks in declining years
• Again designate base disposition for 80-plus?
• Old and weak time of life
• Weakness of the old
• Dance orchestra opens Gate production of The Declining Years
• Old age infirmity
• Senility of Venice's bigwig entertaining volunteers
• Old age condition; senility
• When one's getting on with female penning graffito