Hacker News Reader

> Age moves in one direction so it has a simple merge function:

Better to use date of birth as that doesn't change at all.

I regularly deal with people older than the my country's identity documents. Their "official" dates of birth are frequently off by several years and have to be manually corrected in all databases and systems.

It can though. Some people have different DOB on different identity documents.

Reply on news.ycombinator.com