The only one meaning of life that we can have in our lives (redundant) is the one that we (convention) give it. However it depends on (formality level) our intelligence and cultural background. According to Peter Medawar, Nobel prize in Medicine, intelligence began to decrease in the 40's and this will continue to decrease but not forever. As far as I'm concerned intelligence will keep decreasing infinitely because our species is devolving / regressing; that's why there are few people with understanding and a lot of stupid people.