BIS central bankers’ speeches  3  generations, and since younger generations tend to borrow more heavily than older generations, a drop in their share results in a decline in the natural rate of interest through a decline in loan demand.
Nearly every major bout of financial instability has called for some degree of monetary easing - most often only temporarily until the threat of the low-probability but high-cost economic disruption has passed. Other tools have been used occasionally, and an assessment of their costs and benefits has depended on the nature of the crisis.