Aren't there more important problems that humanity should solve first?
Currently, more than 100,000 people die every day from age-related diseases, and age-related diseases cause an indescribable amount of suffering. We are not saying that other problems are not important too, only that the faster development of effective medicine against age-related diseases should be among the very top items on the list of priorities. After all, there is nothing that costs even nearly as many human lives as aging. Moreover, we have enough resources to tackle several problems at the same time. So there is no reason to let children in developing countries starve while we deal with environmental pollution, and there is also no reason to shy away from fighting aging while we research how to bring malaria under control medically (and vice versa).
In addition, eliminating aging would free up enormous amounts of resources. These freed-up resources could be used for "more urgent problems" once aging has been cured. That is why fighting aging seems to us to be a good investment - even with these "more urgent problems" in mind.
External links on prioritization (all in English)
Article by the Lifespan Extension Advocacy Foundation
Lifespan Extension Advocacy Foundation: Aren't There Worse Problems Than Aging? | LifeXtenShow