https://phys.org/news/2018-07-worms-secret-longer-life.html

While people today live longer than ever before, age-related diseases such as dementia and other neurodegenerative conditions rob people of the chance of living healthy lives into old age.

But researchers have a secret weapon in the battle with the ageing process – the humble worm. Flatworms have the ability to regrow large parts of their bodies after losing them. Roundworms, meanwhile, may hold the secret to counteracting neurodegenerative scourges like Alzheimer's disease and conditions such as muscular dystrophy.