[Tsunami]

Age is no issue, prior injury is no issue as long as it has healed correctly. The only issue I have is it appears you are choosing the Army only because they will allow you in due to age... I admire your sense of wanting to serve, but you are doing yourself and the Army a disservice if you are "settling" on the Army because of age.
A buddy of mine [who is armor as well and is an O-3 (we were both prior enlisted and later put through OCS), but is Guard] and I had this discussion the other day... He has seen it a lot in the Guard, maybe its due to the recruiting frenzy we have going on - but there has been an influx of new recruits that loose their zeal and walk while in pre-phase (rfp). Pre-phase is when you will drill with other recruits and their are NCO's that will get you in shape and squared away before you ship to boot camp.
It's my opinion, and take it at face value - that this is due to recruits "settling" on the Army. When they are introduced to both the physical and mental aspects of the job they realize that couch with a cold beer watching Sunday football wasn't to bad after all... Here's the kicker - ITS OK to think that - it saves you and the Army money and man hours.
If you want the Army bad enough - go down to the recruiter and be honest about your health and any other concerns, they will advise you and believe me, if there is a way to get you in - they will do it!