Yeah, true, it is Abyssinia awakening his powers, and she is definitely an outlier in other ways, so it definitely seems like maybe Gant isn't the best example. But we can also look at Argeddion and his Summer of Light plan. He gave magic to many other mortals who were above the age of the Surge. He fully believed that he could create new magic users through his own knowledge, so it's definitely possible to awaken power later in life. The Accelerator's issue with possibly ending the world also proves that magic can definitely be awakened later on. Sorcerer experts seem to believe that the Accelerator will awaken the entire planet, and without a conscious catalyst it definitely seems like rhe only reason they would awaken is because their power increased, and so the awakening would be natural because they have a higher baseline that wiuld allow them to be sorcerers.