Answer:
From an evolutionary gene's-eye perspective, the genes are immortal, and our role, the meaning of life, is to perpetuate the genes. In a few centuries, all traces of our existence as human individuals -- memories of us, all our accomplishments --will likely be gone and forgotten, except for genes that survive from those of us who successfully reproduced through the generations.
But, of course, we don't experience the world from a gene's eye evolutionary perspective. One experiences the world as an individual person, not as a gene dispenser (fun as that may be). The joy we get from parenting comes not from some abstract generic idea of gene propagation,
