Never heard about that kind of enhancement before. Seems a little bit weird to me that a premeditated murder of someone older than 60 is considered to be more egregious than the premeditated murder of someone in their 20s. All murders are very, very bad but on a purely rational basis, murdering younger people is taking away more potential years of life.
Edit to add:
My wording above was perhaps inartful. I don’t believe that a 20 year old’s life is worth more or less than that of a 60 year old, which is why this enhancment struck me as strange. That is all.