Not the poster nor am I endorsing this, just explaining it. Everyone who works full time would benefit from a shorter work week. Only people who live to retire benefit from a lower retirement age. So if you're considering the two policies as alternatives, then one is definitely a raw deal for people who die early. Given relatively few people die after starting to work full time but before retirement age, I don't think that's the issue with this proposal.
Ah, ok, I understand this. Yes, as an alternative to other policies to make people's lives of mandatory toil better, I see the raw deal for some of doing nothing other than lowering retirement age. (Of course, I'm a "Why not both?" guy.)