What is the average lifespan of a man in the US?

That depends on the region of the world that you refer to. In most industrialized countries is now 80 and increasing. The regions with more longevity are country areas in semi-industrialized countries with moderate climate where the average life span of men is 90 and of woman 95. In countries where cardiovascular disease and environmental pollution are factors of public health concern, the average is 70 for men and 75 for women.