We can automate this with bidets. For a less literal interpretation, euthanasia (legal or otherwise) is how I'd like to avoid this stage of life entirely, it's

We can automate this with bidets. For a less literal interpretation, euthanasia (legal or otherwise) is how I'd like to avoid this stage of life entirely, it's now a legal possibility where I live if there's a terminal condition preventing me from wiping my own ass. Many people get to skip this stage in life entirely though, either through good health or misfortune.