I sure don't look 45. I figured I "re-set my clock" with the neurogenesis. The way it happened makes me wonder if it will be perpetual, though. With re-setting my clock, signs of aging will be delayed.
The neurogenesis was the repair of neural damage in my brain cells. Aging would be damage to all cells. If it was my stem cells that repaired damage, then there would be repair throughout my body.
Enough information does not exist yet to determine any outcome. I used the word "if". This is all possibility. We don't know for sure unless it does or does not happen.