TIFU by destroying a colleague's dreams of retirement in 2 years.

Requisite this didn't happen today, but a few years ago. I worked for the Federal government, and we used to have this program where you could check to see your hire date, years in service, make sure all promotions, etc. were all correct. On this program, after you signed in, the front page showed how many years, months and days until you were eligible for retirement. So, like all good things in the government, they decided to do away with that program, and replace it with another, worse program. I was explaining this to a colleague, about how I was upset that I wouldn't be able to check the retirement feature quickly any more. She asked me when I was eligible, and I said "oh in about 4 years, but that I'd probably stay a few additional years." And then she stated she only had 2 years left. I was flabbergasted. I knew I was about ten years older than her, and I knew what year she entered, because it was the first year of a training program she came in on. So I asked her how many years she thought she had to stay in service, and she said 20 for full retirement. So I told her she had to do 30 years for full retirement unless she met certain requirements. And she insisted she was right. So I told her to look it up in the program that was going away, and sure enough, she had almost 12 years left. She didn't speak to me for about a week.

TL;DR: A colleague thought she could retire after 20 years of working, I corrected her, telling her it was 30 and she didn't talk to me for a week.