So this dude and his team is known for research into longevity and trying to slow down and even revert aging.

He and his team managed to revert rat neurons to youthful stage where they regained the regenerative capabilities of young rat neurons. It was done by inserting 3 genes that produced yamanaka factors into the rat neuron. Yamanaka factors are also used when turning adult cells into induced pluripotent stem cells.

So it seems yamanaka factors can be used to rejuvenate cells. Now this could maybe be used in dealing with cell senescence where cells lose function as the individual ages and accrues DNA damage and epigenetic additions. You'd essentially restore cell function that was lost due to old age.

However, what if this could turn the cells of the penis back to a state where they respond to certain stimuli with growth? You could do something like this:
>Rejuvenate cells of penis to a state where they grow in response to certain hormones
>Treat the individual with various hormones to induce growth of the penis
>Repeat if needed

Discuss.