Comment by keithluu

Hey everyone! I built a site that shows your next age milestones, all on a single page. You can see your next milestone age for each type (like your 10000th day) and save it to Google Calendar.

It looks simple, but I learned a lot building this site:

* To calculate age in planetary years, I had to look up their orbit and rotation info

* The lunisolar calendar took me quite some time to figure out (it is not the same as a lunar calendar and even changes by country)

* Adding the dog and cat age equivalents even led me to cubic splines

Link to the site: https://ageequivalent.com/