Vladimir Putin has sunk billions of Russian dollars into outlandish human longevity experiments — but some critics are skeptical whether the so-called-science has any grounding in reality. Putin, 73, has dropped at least $26 billion on state research for the likes of gene-therapy drugs intended to slow cellular aging in a project known as “New Health Preservation Technologies,” the Wall Street Journal reported . That drug “represents one of the most promising avenues in the fight against aging,”