Should be very careful about procrastinating things like taxes, paying bills. Not just in late fees and penalties but to show you can handle your affairs.
Know someone who has been behind on their taxes for about a decade now. They eventually pay. BUT after several physical medical issues over the last few years and signs of dementia a court is going to use things like unfiled taxes to show they are not competent to handle their affairs. Add unkept home, piles of projects(hoarding) and leaving delivered meals outside for days on end they are about to be permanently committed to a facility NOT of their choosing at the moment. Part of the issue that family and social workers can't determine what they can afford because of poor financial record keeping.
On one hand one is retired and shouldn't have rush, sweat deadlines, fuss over details and tidyness. On the other hand if certain things are not done it will make ones' final years a living heck.
Once 'the end' starts it's final phase things can spiral out of control quicker than they ever have. Even retired don't live on your laurels and go about life with a purpose including staying active, fit and on top of things like a soccer mom managing kids, a house hold and job.