Add siblings, parents, or spouses and see everyone ranked oldest to youngest, with the exact age gap between each person.
Add at least two dates of birth above to see the full ranking.
As many as you like - add rows for every sibling, parent, or spouse you want to include, and the tool ranks everyone from oldest to youngest.
Each gap uses exact calendar math - full years, months, and days - not a simple 365-day average, so it stays accurate across leap years.
The Generational Age Calculator answers a single question - how old was one relative when another was born. This tool ranks any number of people at once and shows the gap between each of them.
Results are calculated locally in your browser. The details you submit may be logged to help us understand how the tool is used, but they are never shared publicly or tied to your identity unless you are signed in.