Umbrella Academy: How Old Each Sibling Really Is After Season 2
The seven members of the Umbrella Academy were all born at noon on October 1st, 1989, but thanks to some time travel shenanigans the Hargreeves siblings are all different ages by the end of The Umbrella Academy season 2. After failing to stop the apocalypse at the end of season 1, Five threw the whole family back in time to the 1960s - and much like his previous attempts at time travel, things got messy.
Five, Luther, Allison, Klaus, Ben, Vanya and Diego all land in the same alley in Dallas, Texas, but end up scattered over a period of three years at the start of the 1960s. This means that some of them end up stuck in the time period for long enough to start new lives (Allison gets married, and Klaus starts a cult), while others only get a month or two of respite before it's back to trying to stop the end of the world. The last to arrive is Five, who gets to Dallas just in time to witness a full-blown war between the Soviets and the USA that culminates in both sides launching nuclear missiles at each other. Fortunately, Five's old friend Hazel is there to help him escape.
The ages of the Umbrella Academy members were already thrown off in season 1, when Five spent a long time stuck in the post-apocalyptic future and Klaus accidentally time-travelled back to the Vietnam War. In the wake of Five's botched group trip back in time, they're even more out of whack. Here's how old the Hargreeves siblings are after The Umbrella Academy season 2.
After his first, disastrous attempt at time travel, Five ended up stuck in the post-apocalyptic future for 45 years with only a mannequin called Dolores for company. He was 13 years old at the time of his disappearance, and in season 1 Five confirms to Luther that his body is 13 years old once again, while his consciousness is still 58. From Five's perspective, it's only been a couple of weeks since he jumped back to 2019 and tried to stop the apocalypse the first time around, so he's still 58 at the end of The Umbrella Academy season 2. There is the matter of the time that he spent working for the Commission, but time doesn't seem to pass for the Commission's agents, since they operate outside of it.
Like most of his siblings, Klaus is 29 years and five months old during the events of The Umbrella Academy season 1 (which is set in March 2019). However, after a mishap involving a stolen Commission briefcase he travels back in time to 1967 and spends ten months fighting in the Vietnam War, making him 30 years and three months old when he returns to the present. Klaus is also the first to land in the 1960s after the group time-travels to avoid the apocalypse, finding a magazine that puts his and Ben's arrival date at February 11, 196o. A little more than three years and nine months passes before he is reunited with his siblings, meaning that Klaus has just turned 34 at the end of The Umbrella Academy season 2 - though no one could blame him for losing track of his age.
Upon arriving in 1963, Five is fortunate enough to run into a conspiracy nut called Elliot, who has been monitoring the arrival of each member of the Umbrella Academy in the alley outside his store. Elliot's board of photos and newspaper clippings puts Allison's date of arrival at June 29th, 1961. This means that a little less than two years and five months pass before she is once again called upon to stop the apocalypse, making her 31 years old (closing in on 32) in The Umbrella Academy season 2.
Thanks once again to Elliot's conspiracy board, we know that Luther arrives in Dallas on April 10, 1962. Finding himself all alone, he starts working for mobster Jack Ruby as a fighter and club bouncer, while periodically returning to the alley to scream Allison's name. A year and seven months pass before he is finally reunited with Allison and his other siblings, meaning that Luther has just turned 31 years old by the end of The Umbrella Academy season 2.
At the start of The Umbrella Academy season 2, Diego lands on September 1st, 1963 - two and a half months before the Kennedy assassination. His superhero aspirations mean that he immediately sets out to try and stop the assassination from taking place, and ends up confined to a mental institution after being caught stalking Lee Harvey Oswald. Though being locked up was definitely no picnic, Diego has one of the shorter sentences in the 1960s, and is still 29 years old at the end of The Umbrella Academy season 2.
Vanya arrives on October 12th, 1963, just over a month before Five travels back to stop the 1960s version of the apocalypse from happening. This means that she's now the baby of the family (out of the living family members, anyway) and, like Diego, is still 29 years old. After being immediately hit by a car that Sissy was driving, Vanya spends the first few weeks of her '60s life experiencing amnesia and blissfully unaware of her mostly miserable life so far.
Ben's age is perhaps the most difficult to fathom out of all the members of the Umbrella Academy. Despite being a ghost he has physically aged alongside Klaus, perhaps because of their strong connection to one another, or perhaps because his appearance is based on Klaus' perception on him. Depending on whether Ben went back in time with Klaus to Vietnam (which the show has never made clear), this would mean that he has experienced - though not lived through - 33 to 34 years. But regardless of his ghost years, Ben was killed when he was 16 years old and will sadly never grow any older than that. At least... not in the original timeline.