Rarely has the phrase “he looked about 12″ been so close to the mark.

Celtic under-20s fielded 13-year-old Karamoko Kader Dembele on Monday night. That’s right – 13.

13-year-old Karamoko Dembele was subbed on for Celtic U20's last night. Must be some player #CelticFC #mmlove pic.twitter.com/UTg5OTdPGF

— Mario Melchiot (@MarioMelchiot) October 4, 2016

Some cracking photos of Karamoko Dembele making his debut last night, from KDS. 2 defenders around him already… pic.twitter.com/aPEig28W6q

— FirstLastForever (@CelticForever) October 4, 2016

No relation to 20-year-old Moussa Dembele, who has 12 goals for Celtic’s senior team this season, Dembele came on as a substitute with nine minutes to go in the under-20 win against Hearts.

Fans have reacted had various forms of reaction to the news of the young man’s achievement. Such as…

The genuine appreciation

Celtic's 13-year old wonderkid Dembele is something else. Wow!!!

— Arrogant Warrior (@That_Obansa) October 4, 2016

That 13 year old Celtic player is quality!

— Lee Quilter (@LeeQuilter2) October 4, 2016

Apparently Dembele did hold his own too, with Celtic’s website saying he “didn’t look out of place” and “played his part in the closing stages.”

The look in the mirror

A 13 year old is after playing an under 20s game for Celtic meanwhile I'm sitting here whether I'm having cookies or oreos for dinner. 😂😂😥

— Harvey Rael (@HarveyRael1) October 4, 2016

Of course, any achievement for a younger person sparks thoughts about our own lives. Check yourself Harvey…

The thoughtful self-reflection

13-year-old Karamoko Dembele debuted for Celtic U20s tonight.
When I was 13 I was stealing dustcaps off cars and using a Blackberry Curve.

— joshua jones (@joshuapsjones) October 3, 2016

Of course you were.

La reflexion

Karamoko Dembelé 13 ans qui débute avec les U20 du Celtic 😱 à 13 ans je joué à Pokémon moi

— Un Programme 💥🔥 (@KvinBrancourt) October 4, 2016

The admiration for Dembele has been international – as has the self-reflection. This French-speaking user points out they were playing Pokemon at 13, not professional football.

La admiracion

KARAMOKO DEBUTA VON EL CELTIC CON 13 AÑOS.
ES INCREÍBLE.
DE VERDAD SE LLAMA KARAMOKO?

— Pozas Enfurecida (@Pozasenfurecida) October 4, 2016

Spanish speakers have been talking about it too. “Angry Pozas” here said it was incredible the 13-year-old played, finishing “truth is called Karamoko”. Indeed Pozas, indeed.

The deja vu

@mg4realz the 13 year old from Celtic

— BobbyTymz (@Tymz_Infinity) October 4, 2016

They have a point there, as well as the two Celtic Dembeles there’s also Tottenham’s Belgian midfielder Moussa Dembele, 29, and Oussmane Dembele of France who signed for Borrussia Dortmund in the summer. Ronaldos eat your hearts out.

The realisation

Karamoko Dembele comes on for #Celtic U20s
He was born in 2003 pic.twitter.com/diLlIqdPr8

— Ladbrokes (@Ladbrokes) October 3, 2016

Yes, that’s right, 2003. It’s okay, we know.

Karamoko Dembele has made his debut for Celtic's Under-20 team tonight against Hearts.
He's 13 years old. pic.twitter.com/Os5azJE7PD

— Liam O'Hare (@Liam_O_Hare) October 3, 2016

Just in case you needed some reminding.