----I AM NOT AN ATTORNEY--
However, regardless of your age, I think this is a fair question.
Past convictions are, generally, not on trial, Such is the rulings of most state supreme and our US Supreme courts.
Such information must be pertinent to the situation being judged.
There is good reason for this too be so. A person can be a really bad person, have been in prison at a time prior to the event, but be completly legal in his own self-defense in this situation. To bring up prior convictions and to put his past up for judgement could unduely effect the jury--in effect putting those things already judged up for re-judgement.
This is hotly argued, and in some instances I think past actions should be considered for the present, but not so, as decreed by the courts, well, er, most of the time.
Blessings