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How old are Sherlock and Mycroft Holmes in the BBC Sherlock TV-Series? Do they have other brothers and/or sisters?

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As referenced in His Last Vow there was at least one other brother. – Meat Trademark Jun 15 '14 at 18:55
@MeatTrademark I'd correct that to "As hinted [...] there might have been". – Napoleon Wilson Jun 15 '14 at 19:01
Related: – Napoleon Wilson Jun 15 '14 at 19:08
@NapoleonWilson Mycroft said, "Don't be absurd. I'm not to given to outbursts of brotherly compassion. You know what happened to other one." Seems pretty straight-forward. Besides, it's too late to edit that comment. AND you beat me to posting that related question. – Meat Trademark Jun 15 '14 at 19:08
I hope they don't say Moriarity is the third brother :/ – Dredd Jun 16 '14 at 14:24
up vote 10 down vote accepted


For there is no reference in the show, one can only assume that they are the same age as the actors:

  • Sherlock: 34 in S1 (Benedict Cumberbatch, born in July 19, 1976)
  • Mycroft: 44 in S1 (Mark Gatiss, born in October 17, 1966)

If you are going with the canon, however:

  • Sherlock: 27 in S1 (In His Last Bow, which is set in 1914 Sherlock is described as "He was a tall, gaunt man of sixty, with clear-cut features" so he must be born around 1854 and he first met with Watson 1881)
  • Mycroft: 34 in S1 (In The Greek Interpreter Holmes tells Watson that Mycroft is "Seven years [his] senior")


As pointed out before the show makes a reference to "another one". So there is a possibilty that there is another Holmes brother. But at the end of S3, we can only guess.

According to the novels A.C.D. wrote, there is no other brother mentioned. But a possible explanation that there might be one, is given here:

Holmes once stated that his family were country squires, which means that the eldest brother would have to stay to manage the house. If Mycroft were the eldest then he couldn't play the role he does in four stories of the Sherlock Holmes canon, so Sherrinford frees them both. This position is strengthened by the fact that Mycroft's general position as a senior civil servant was a common choice among the younger sons of the gentry.

Since the series takes place in the 21th century, there is no need for the eldest brother to manage the house. This only leads us back to guessing ;)

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I don't think that actors' age gives much. My favorite counterexample is The Vikings where Ernest Borgnine plays the father of Kirk Douglas' character. Douglas was two months older than Borgnine. – his Jun 18 '14 at 10:02
Yes that's why I put the canon ages in. For we don't know how old exactly Sherlock is at the beginning of A Study In Pink (probably something in between 27 and 34), I think it is save to say that Mycroft is indeed 7 years older than him (what reason should Gatiss and Moffat have to change that fact?). – whitespace Jun 18 '14 at 12:00

Though there has never been a direct mention about Sherlock's or Mycroft's age, but in the episode The Empty Hearse, there is a slight reference.

SHERLOCK: I didn’t know you spoke Serbian.

MYCROFT: I didn’t, but the language has a Slavic root, frequent Turkish and German loan words. (He shrugs.) Took me a couple of hours.

SHERLOCK: Hmm – you’re slipping.

MYCROFT (smiling tightly): Middle age, brother mine. Comes to us all.

Regarding the third Holmes sibling, nothing has been made clear yet. Hope the coming seasons will reveal the mystery.

Source (Transcript) : Ariane DeVere

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