First of all, congratulations on making it to double my age and spending it doing real good for humanity in general!
I think that extending lifespan is a vastly good thing in that it will make a lot of people think of the mid and long term consequences of their actions.
The only downside I can see from this would be if this tech were available to those in primitive, religious cultures that value fecundity as a sign of devotion towards their gods that has for whatever reason rejected mental augmentation.
This will lead to the earth becoming vastly overpopulated to soylent green levels with all the fun resource wars that are sure to follow as matter may be practically unlimited with recycling and replicator tech but actual square footage will always be a premium until we can shift mars and venus into the habitible zone and do some serious terraforming. But by that time it will be too darn late.