I'd put aging a lot farther down the list of big problems. I'd much rather him dedicate resources to stopping malaria in Africa, granting children and average people a shot at living, than to give money to extend grandma and grandpa's lives by a few more years.
What about extending the prime years of scientists, engineers, etc? More years of experience and wisdom to capitalize on and to reinvest their skills and knowledge into human progress. I for one would prefer that many of the brightest candles in humanity's past were still lit.
