If there is some specific reason of hair loss (e.g. medication, illness, hormon issue) it can be prevented or even re-growth is possible by reversing the cause. For all other reasons, there is no any effective ways to treat hair loss. If you are really young or your wife is too worried of your look, then you may consider of cosmetic hair implantation.. 

But dude, baldness also looks glamourous if you maintain proper bodyshape and clothing style. No need to worry.