You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Capital_punishment_in_the_United_States

Context:
Sixteen was held to be the minimum permissible age in the 1988 Supreme Court decision of Thompson v. Oklahoma. The Court, considering the case Roper v. Simmons in March 2005, found the execution of juvenile offenders unconstitutional by a 5–4 margin, effectively raising the minimum permissible age to 18. State laws have not been updated to conform with this decision. In the American legal system, unconstitutional laws do not need to be repealed; instead, they are held to be unenforceable. (See also List of juvenile offenders executed in the United States)

Question:
According to Thompson v. Oklahoma, what was the youngest age at which a person might be executed?

Sixteen