You think wrong.
What you are proposing would not yield the results you predict.
If he is older than the control skeletons, he would have more C-14 in his bones, because it accumulates as long as you are alive and eating.
No, you are evincing a fundamental misunderstanding of the C-14 cycle.
The concentration of C-14 in a living organism does not accumulate or increase over the course of the life of that organism. Rather, it is more or less constant.
Thus, the concentration of C-14 in the body of an unborn baby is roughly the same as in the body of its (obviously: much older) mother. We start out life with approx. the same concentration of C-14 in our bodies that we have when we die, even if a century later.
The C-14 Dating Method is based upon the (very compelling) premise that living organisms are in equilibrium with their environment, and that, only upon death, when living organisms cease constantly exchanging C-14 with the biosphere - where "fresh" C-14 is constantly being created due to incident cosmic rays transmuting atoms in the upper atmosphere - does the C-14 in our (now dead) bodies cease being continually replenished; the concentration of C-14 can then finally begin diminishing, due to radioactive decay.
Regards,
Oh, well that's entirely different. Nevermind!