Civil servant Wong Yujie, 33, was teased non-stop by his friends after trying out software giant Microsoft's latest website, How Old Do I Look (How-Old.net).
That is because his wife, recruitment consultant Kerina Kuan, 29, was shown to be 10 years younger, according to the site's analysis of their photo. He was shown to be his current age.
Mr Wong says: "My friends joked that my wife was in fact my younger sister, and that I was 'an old cow eating tender grass'." He is referring to the literal translation of a Chinese proverb describing the romantic pairing of two people whose ages vary greatly.
He adds: "My wife was very tickled and we shared a good laugh."
Not everyone has found the results of this facial-recognition, age-guessing website funny though, especially if it analyses you as wildly older or misreads your gender.
The website was launched more than a week ago at Microsoft's Build 2015 developer conference in San Francisco and has since gone viral worldwide.
Users upload a photo of themselves - or anyone else - to the site and the machine learning algorithm embedded within the site will detect and guess the age of those in the photo within seconds.
The results are varied: Some are spot on, others are way off. The especially heinous and embarrassing mistakes have been making their rounds on social media and spreading hilarity among friends like Mr Wong's.
According to an online write-up by two members of the Microsoft team on May 2, they had hoped for "perhaps 50 users" to test the site, but ended up with more than 35,000 users within hours.
Mr Joseph Sirosh, Microsoft's corporate vice-president in the company's cloud and enterprise group, tweeted that in four days - by May 4 - the website had seen 33 million users and 240 million pictures analysed.
Judging from the various articles and social media feeds, no one has been spared - not even the dead.
CNN International ran photos of US President Barack Obama and Madonna through the website. Mr Obama was shown to be 58 (he is 53) and the singer was shown to be 31 (she is 56).
BuzzFeed News site's compilation demonstrated how the website could detect the age for Michelangelo's masterpiece, the statue of David (supposedly 27), and that of Egyptian pharaoh King Tut (supposedly 87, although his corpse is thousands of years old).
Over the last few days, the website has been trending on social media here too.
Women who tried the website and whose ages were significantly reduced by the tool were flattered by the results.
Some were shown to be more than two decades younger than they actually were.
Model-actress Ase Wang, 33, was shown to be 18 in the picture she uploaded.
"It was nice to pretend I was 18 for that one second until reality kicked in," says the resident judge of reality show Supermodelme.
Those who had their current age reflected by the website were pleasantly surprised, while others questioned its purpose and detection techniques.
Engineer Grace Loh, 41, says: "I wonder what the website can be used for and if it can see through botox and plastic surgery."
Some pooh-poohed the website and its results altogether.
Ms Lesha Mansukhani, 18, who is waiting to enter university, says: "I'm so angry. This feature made me a 53-year-old male."
Junior college student Keif Tan, 18, uploaded a picture of his clean-cut, smiling self and it said he was a 16-year-old female. He tried again with two other pictures, with the same results, gender-wise.
"The website is inaccurate and not trustworthy. I'd advise people to use it with caution," he says.
Generally, those with beards or who wear sunglasses in the photos are "aged" by the website.
Theatre actor Darius Tan, 36, would know. The first image he uploaded of himself wearing sunglasses showed him to be 44.
"My reaction was, 'How can?'" he says.
He then tried the website again with another image, without his shades on, and this time, it showed his age as 26.
"To be 26 again? I can only dream," he says.
Additional reporting by Ong Kai Xuan
Ms Jehan Machacon
Project director in a marketing agency
Real age: 38
“This is hilarious. It made me 25 years younger, although I’m not sure if it’s flattering to be mistaken as 13 when I’m actually pushing 40.”
Mr Mohd Hanafi Shufaat
Real age: 46
“I was very happy that it said that I looked 42. I think it’s because I exercise and have a healthy diet, which makes people look younger and healthier.”
Ms Lesha Mansukhani
Waiting to enter university
Real age: 18
“I’m so angry. This feature made me a 53-year-old male.”
Real age: 26
“Even though it’s just a two-year difference from my actual age, I’m happy to know I look younger than a quarter of a century.”
Mr Keif Tan
Junior college student
Real age: 18
“The first time I tried the feature, it said I was a 16-year-old female. I tried it again twice with different pictures, but the results maintained that I was a woman. I found that funny.”
Mr Gabriel Yong
Project controller in a construction firm
Real age: 45
“This feature is lousy. It doesn’t accurately judge a living person’s age. I don’t really mind the age it showed, though, because it’s just for fun, nothing life-changing.”
Ms Kerina Kuan
Real age: 29
Mr Wong Yujie
Real age: 33
Says Mr Wong: “This feature can be accurate as it predicted my age, but my wife is shown to be 10 years younger. My wife is very flattered and pleased with her result, of course.”
Mr Benjamin Broughton
Ms Yu Huimin
Real age: Both 21 and dating
Ms Yu says: “I was shocked at the results and upset that they think I’m so old. I tried a few more photos and I was always at least five years older than Ben.” Mr Broughton says: “Everyone says that I look a lot older than her and older than my age, so these results were funny.”
Mrs Monica Yeo
Real age: 51
Her daughter Lorraine
Real age: 17
Says Mrs Yeo: “Thanks for more than halving my age. But most people’s results show them to be younger than they really are.”
One of the Top 10 Most Popular Male Artists at the recent Star Awards
Real age: 24
“I think looks are deceptive. I feel much older than this and I’ve always felt that I’m an older soul living in a younger body. I guess this proved that my thinking was right.”
Actress who played the lead villain in Season 4 of local immigration drama Point Of Entry
Real age: 25
“I think it’s flattering that I look like I’m 16, but honestly, I’m very happy being 25. It took me 25 years to know what I do know and I wouldn’t trade a few years of ‘looking good’ for the wisdom I have now.”
Local actress and host
Real age: 33
“This feature makes me instantly younger – what’s there not to like about it? But I must say that physical age is really only a number and is ultimately superficial. It’s far more important to cultivate our inner selves. What’s the use of looking young and beautiful but being rotten inside?”
Fann Wong and Christopher Lee
Local celebrity couple
Real age: Both 44
Says Wong: “So fun! I wonder how this feature derived our ages.”
Lee Teng (centre)
Local television host
Real age: 31
MediaCorp actors Jeffrey Xu (left), real age: 26, and Ian Fang (right), real age: 25
Lee says: “Jeffrey, Ian and I shared a good laugh about it. Jeffrey says the website is inaccurate. But I think the website is very accurate, given the fact that I am really only 21.”
Former Class 95FM deejay
Real age: 40
“I love this! Especially as it thinks I’m seven years younger than I am.”
Real age: 38
Chong says: “The results are very encouraging and it gives me confidence that I can act as a 20something.”
SundayLife! runs its own test of some famous faces
The singer is 21.
Human rights lawyer Amal Alamuddin is 37, while her husband, actor George Clooney, is 54.
Prince William and his wife, Kate, are both 33 this year.
The singer is 29.