Some life admin involves doing the same things that are done in an office. Other admin is merely analogous to office work. For instance, making a grocery list or planning a child's birthday party is not precisely an activity that would be done in the workplace.
2019, Alexandra Jones, “'I feel bombarded with to-dos': the hell of life admin – and how to get on top”, in The Guardian[2]:
According to one 2018 survey of 2,000 Brits, the average adult carries out 109 life admin tasks a year, from sorting out car insurance to paying council tax; about half the respondents admitted they struggled to keep up with household paperwork.