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What your hardwood floors need and how often, how long they usually last.
A typical schedule is every 10 years.
Usually 30 to 100 years. Where yours sit in that range depends on when they went in and how they've been looked after, which is why the install year is the most useful thing to write down. Something past its typical life isn't due for replacing on that account: most things are run until they fail. It's a reason to put money aside, not to spend it.
Generic schedules start from the calendar. Yours should start from your house. Keeping House takes the year each system went in and works out what's due and when, sends the reminders, and keeps the history a buyer or insurer will ask for.
Intervals and lifespans are typical figures for U.S. homes, in line with commonly cited industry ranges; costs are rough installed prices in 2026 dollars. Your manufacturer's manual and local conditions come first.