Conversation so far:
What year did Queen consort of England Jane Seymour die?
She died on 24 October 1537 at Hampton Court Palace.
How did Queen consort of England Jane Seymour die?
She died of postnatal complications less than two weeks after the birth of her only child
What illness did Queen consort of England Jane Seymour have before her death?
Seymour died of puerperal fever, an infection that can occur post childbirth.
How many children was Queen consort of England Jane Seymour survived by?
She died after the birth of her only child, a son who became King Edward VI.

Question: How old was the heir when she died?
Self-contained rewrite: How old was the heir when Queen consort of England Jane Seymour died?