The same gene that makes flies live longer also exists in humans. With this gene identified, future drug therapies could attempt to extend the life span of humans to 150 active years or longer. There isn't a simple answer to that. But one important aspect of aging was discovered in the early 1960s by Leonard Hayflick. Hayflick discovered that aging occurs on the cellular level.
Cells divide and replicate themselves over the course of our lives.
However, each cell has a built-in clock that says how many times it can divide. Beyond a certain point, the cell ceases to be able to divide or repair itself. This loss of the ability to divide is called cellular senescence. An interesting aspect of research into cellular senescence has shown that the ticks on a cell's internal clock seem predetermined. This is separate from chronological time.