Reuters reports on a recent presentation by Aubrey de Grey of the SENS Foundation: "'I'd say we have a 50/50 chance of bringing aging under what I'd call a decisive level of medical control within the next 25 years or so,' de Grey said in an interview before delivering a lecture at Britain's Royal Institution academy of science. .... And what I mean by decisive is the same sort of medical control that we have over most infectious diseases today. ... De Grey sees a time when people will go to their doctors for regular 'maintenance,' which by then will include gene therapies, stem cell therapies, immune stimulation and a range of other advanced medical techniques to keep them in good shape. ... The idea is to engage in what you might call preventative geriatrics, where you go in to periodically repair that molecular and cellular damage before it gets to the level of abundance that is pathogenic. ... For some, the prospect of living for hundreds of years is not particularly attractive, either, as it conjures up an image of generations of sick, weak old people and societies increasingly less able to cope. But de Grey says that's not what he's working for. Keeping the killer diseases of old age at bay is the primary focus. ... This is absolutely not a matter of keeping people alive in a bad state of health. This is about preventing people from getting sick as a result of old age. The particular therapies that we are working on will only deliver long life as a side effect of delivering better health."