The Bible doesn't explicitly state John the Baptist's age when he died. However, we can estimate it based on other information:
* Relative to Jesus: Luke 1:36 says that Elizabeth (John's mother) was in her sixth month of pregnancy when the angel Gabriel announced Jesus' birth to Mary. This would make John about six months older than Jesus.
* Jesus' age at his ministry: It is generally accepted that Jesus began his public ministry around the age of 30 (Luke 3:23). John's ministry preceded Jesus' ministry.
* Speculation: Some biblical scholars estimate John's death occurred when he was in his early 30s.
Given the circumstances, a reasonable estimate would place John the Baptist's age at the time of his death to be in his early 30s.