In the biological world, molecules such as cells and living beings happily play with each other. Supported by each other, they innovate, interact and transform the planet. Nested genes, microbial scaffolding, partnerships between organisms, evolution has always been a matter of interlocking networks. Could interference between microorganisms and our own biology explain the phenomenon of ageing? We will approach this question from an interspecific angle, with the prospect of possible biotechnological hybridisations.