Conversation so far:
What was Leonardo da Vinci age
67 when he died.
How did Leonardo da Vinci die
Possibly of a stroke.
What happen in 1513 to Leonardo da Vinci
From September 1513 to 1516, Leonardo spent much of his time living in the Belvedere Courtyard in the Apostolic Palace, where Michelangelo and Raphael were both active.
When was Leonardo da Vinci buried
On 12 August 1519, Leonardo's remains were interred in the Collegiate Church of Saint Florentin at the Château d'Amboise.
What happen in 1519 to Leonardo da Vinci
Leonardo died.
Did Leonardo da Vinci have a wife
No.

Question: What did he do at an old age
Self-contained rewrite: What did Leonardo da Vinci do at an old age