Age in hours
Your age in hours. At the usual eight hours a night, roughly a third of the total has been spent asleep. For a forty-year-old that is about 117,000 hours.
How to use the age in hours
Hours are the unit where a lifetime starts to feel finite in a useful way. A year is 8,766 hours, so a forty-year-old has had about 350,000 of them and, at eight hours a night, has slept through around 117,000. The waking remainder is the number worth looking at: roughly 233,000 hours, of which working life at a conventional forty-hour week accounts for something like 80,000. None of that is a moral instruction, but it is a different framing from a birthday, and the arithmetic is at least honest about where the time goes.
Questions
8,766 using the 365.25-day average, or 8,760 in a common year.
At eight hours a night, about a third of your total. A forty-year-old has slept roughly 117,000 hours.
About 80,000 at forty hours a week over forty years. Under a quarter of a forty-year-old’s waking hours.
To the day, yes. It does not know your time of birth, so the last day is approximate.
Your device’s. The calculation runs in your browser, so it is today where you are rather than on a server somewhere else.