I think they’re still the same age. But if you back up a few chapters tia got pushed into a magic circle she created to turn back time to protect everyone from what her brother was about to do and Cedric jumped in to pull her out and it sucked years off of both of their lives
SPOILER
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Tia's using sacrificial magic again (like in chp 1) and gave her magic and life. Cedric came to save her, but the deed was done as Tia's life was already deemed as the sacrifice. Therefore, when Cedric saved her, it's akin to gave half of his life force to Tia. So Tia was actually could be assumed as dead, technically. Tia lives now because she's sharing life force with Cedric, and that made them both significantly aged, like someone in their 40s even though they're still in the 20s, because they split Cedric's life expectancy in half for both of them.
Ok I haven’t read this in like a year or so I just solve the most recent chapters what has happened the last thing I remember was that she was pregnant why do they look so old now? Are they still in their mid 20s or are they almost 40?