You can't give a person two decades of their life back either.
Sure, it's better to only take away two decades from someone than all of their remaining years but not as much as people like to believe. Especially when you consider that earlier years have a much higher utility than later years. And later years have again higher utility if you could freely spend your earlier years creating a life you would enjoy, in particular have kids to watch them grow up.
You can't give a person two decades of their life back either.
Sure, it's better to only take away two decades from someone than all of their remaining years but not as much as people like to believe. Especially when you consider that earlier years have a much higher utility than later years. And later years have again higher utility if you could freely spend your earlier years creating a life you would enjoy, in particular have kids to watch them grow up.