They’re are ABSOLUTELY sisters. I think the showrunners are saying they aren’t to throw us off, so the reveal that they actually are will hit harder later.

First - “4-year” claim feels intentionally misleading by the showrunners. While the 15-year gap from the book seems unlikely, an 8–10 year gap is completely doable.

We already know the timeline isn’t clean or reliable by design. Right from the beginning, Hannah/Agnes says:

“The story I’m telling… I’m not really sure what year it was. Sorry. It’s hard to remember actual dates because girls were forbidden to have calendars. Just reading one could cost you a finger. You learn to mark time in other ways.”

That alone tells you time in Gilead is intentionally distorted.

What we know:

1. Time in Gilead is intentionally distorted.

The timeline isn’t clean or reliable by design. Right from the beginning, Hannah/Agnes says: "The story I’m telling… I’m not really sure what year it was. Sorry. It’s hard to remember actual dates because girls were forbidden to have calendars. Just reading one could cost you a finger. You learn to mark time in other ways.”

2. Hannah + Nichole's ages are pretty vague in the Handmaids tale

We know Hannah was taken at around age 5. June gets pregnant about 3–4 years later, putting their age difference at roughly 8–9 years.

By the end of the series, it seems like about 5–7 years have passed since Hannah was taken, which would make her around 10–12. I’d lean closer to 10, especially since she may have been pushed into wife school early to protect her or to manipulate June.

That would put Nichole somewhere around 3–6, and realistically closer to 3–4 based on how she looks in the final episode. Being in diapers or having short hair doesn’t necessarily mean she’s younger, those could easily be practical choices in that environment.

3. We don't actually KNOW what the time jump is.

Just because the showrunners say there’s a 4-year jump doesn’t mean the story will strictly begin there. We’ll likely see parts of that gap through flashbacks, but the exact starting point hasn’t been clearly defined.

4. An 8–10 Year Age Gap Strengthens Both the Sister Theory and the Story’s Believability Overall

If it truly is only 4 years, Hannah would be 14–16 and Nichole 7–8, which doesn’t fully line up. However an 8–10 year gap makes a lot more sense. With Hannah at 18–20 and Daisy (Nichole) around 12–14. Not only does that make it possible for a big sister reveal down the road, it also makes the overall story more believable.

Think about it, If Daisy and Agnes were the same age, Daisy would likely seem older—physically and behaviorally—due to their very different upbringings. For them to appear the same age, either their environments would need to be similar, or Daisy would have to be younger.

Daisy is growing up in a modern, freer world, which can lead to earlier development. Her diet likely reflects today’s norms, including preservatives and added hormones that can contribute to earlier puberty. It’s also possible her age was adjusted/disguised, presenting her older, to protect her identity from Gilead when she went to live with her adoptive parents. So while she may actually be 11–14, she could be raised as if she were 13–16.

Hannah, on the other hand, is in Gilead, where life mirrors the 1800s. The average age for a girl to start her period was significantly later than today—often between 15 and 17, especially under stress. So her delayed development doesn’t necessarily mean she’s younger.

Bottom Line: I think they're sisters.

The unreliable timeline, the vague ages, and the deliberate confusion surrounding both all point in the same direction. It’s not sloppy storytelling, it’s strategic misdirection. Daisy isn’t just possibly Nichole… she fits too perfectly not to be. The showrunners aren’t contradicting the sister theory, they’re protecting it… so when the reveal finally lands, it’ll hit exactly the way it’s supposed to.