The article is:
Rattan SI, Singh R. Gene therapy in aging. Gene Ther. 2008 Nov 13. [Epub ahead of print]
You can read the abstract on Pubmed (19005494).
The conclusions don't seem very optimistic: ' Whether genetic redesigning can be achieved in the wake of numerous and complex epigenetic factors that effectively determine the life course and the life span of an individual still appears to be a 'mission impossible'.'