As an interviewer during our last recruitment we had 21-58 yr old men and woman show up. One applicant graduated college before I was actually born, which I found crazy. I understand how appealing our business has become but its not for everyone. At 40, if you make it you could still put in 25 yrs. Are you willing to do to school one night a week for the next four yrs after working a ten hour day? Its not just a big paycheck, there are so many more responsibilities. Good luck.