34, assuming his (questionable) math is somewhat correct.

The way I'm reading it
31 yrs total at United. 24 yrs so far?
7 yrs to go, making him 58.

The problem is that he claims to be hired mid-98 which makes his time on property to be 22 yrs, not 24.
Somehow he gained an extra 2 yrs of seniority somewhere. A few dog months thrown in???