Thank you for your question.
I want to first identify who I am speaking of when I talk about "The Christ". I am speaking of the person the Christian Bible, and specifically and only the New Testament, identifies as "Jesus of Nazareth" and "Jesus Christ (or "the Christ"). This is He of whom the Bible declares as being conceived by the "Holy Spirit" in a miraculous and sexless act in the body of a girl named Mary, a conception which the Bible reports as being foretold to Mary by an angel of God.
There is no direct statement in the Bible as to Jesus' age at death and no direct statement as to the date of His birth in any calendar form. However, educated guesses as to these things are derived, by scholars, from descriptions of known historical characters and events in the Bible.
In light of the above I am comfortable with most guesses that His age at death was from 34 to 36 years and that His Biblical ministry was about 3 1/2 years.
For more information concerning the scholarship of dating these things may I direct you to the following Internet address:
http://www.neverthirsty.org/pp/corner/read1/r00307.html
I am in no way affiliated with the above-referenced site or organization.
Norm