Suppose I have an experimental organism and that intevention A increases the lifspan by 30% while intervention B increases the lifespan by 25%.
If you combine this two interventions would you then say that the lifespan increase would be 1.3*1.25=1.625 => 62.5% or 1.3+1.25 =1.55 => 55%.
In general would you consider lifespan interventions to be additive or multiplicative?
By the way I found a database of antiaging interventions:
http://sageke.scienc...org/cgi/genesdb
..and a bunch of .pdf´s
http://sageke.scienc...scifeatured.dtl