Ough yeah,, I would've assumed Varia to be in her mid 20s currently (early 20s at the youngest) considering her graduating schools (which I'd assume is akin to university) and working as a civil servant (presumably for a year or few at least) - and wasn't her sister younger than her? The sister has also been married to Leo's bio dad for a year at least, no? I think it'd make sense the sister is late teens/early 20s as well.
I'm also not sure how different the timeline is now compared to the og novel Leo remembers. Varia's first timeline was the same as the OG, but for this one Leo suddenly appeared, and it's not like that hasn't made changes around the people of the story. Also, usually in regressor stories, the regressor tends to seek out another party almost immediately after regressing (esp if they don't regress to a child's age), and I got the idea that Varia didn't do this but bid her time to gather evidence. It's svy I think it's possible the two would've met earlier in the og story.
At least those are my thoughts on the topic, I do not know for sure. I do hope Varia is around the age I estimated bc it'd make their age gap a lot less relevant/an issue. ╮( ̄∇ ̄")╭
I did some digging and the conclusion was Phileo was 29-30 at the start of this story and Leo 7 years old so adding 5 years after the time skip since Leo is 12 y.o that makes Phileo in his mid 30s!
As for Varia based on the the novel she was 25 years old when she first became involved with Phileo and Leo so she is 25-26 right now depending on how much time has passed!
So Phileo mid 30s and Varia mid 20s!
Which is honestly a quite healthy age gap especially considering the historical setting...

I’m so confused about Varia’s age. I know she regressed, so mentally she’s older than she looks, but Leona mentions multiple times throughout the story that Varia is around 18, especially when she and Phelio first started getting to know each other. After that, though, her age is barely brought up again.
We also know that Phelio is somewhere between 28 and 32, so what exactly is the age gap here? I seriously need answers because, in my head, Varia is like 19, maybe barely 20, while Phelio is already in his 30s. That means this grown man is practically falling for a teenager, and I’m sorry, but it’s giving me the creeps. Somebody help me understand this please