Please let me know if at 42 going on 43 in March 2010 I will qualify for enlist in the Army.

Troy.... you may want to go to the Army Wannabe forum and ask your question there.. not knowing the answer I'd say you're close to the line - have you asked a recruiter?

Army Raises Maximum Enlistment Age
Stars and Stripes | By Lisa Burgess | June 23, 2006
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ARLINGTON, Va. — For the second time in six months, the Army is raising the maximum enlistment age for new recruits, this time from 40 to 42, recruiting officials announced Wednesday.

The increase to age 42 applies to both men and women, and older applicants are eligible for the same enlistment bonuses and other incentives available to any other applicant, according to Julia Bobick, a spokesman for the Army’s Recruiting Command at Fort Knox, Ky.

Adding an additional two years to the entry limit “expands the recruiting pool, provides motivated individuals an opportunity to serve, and strengthens the readiness of Army units,” Bobick said.

Guess TroyWG better get a move on.
Good luck.