Firstly, Barry woke up 60 years or so before the birth of Elena meaning sometime in the 1940s and two he will not age since although most of his racial gift as the source is dormant, some abilities like unaging properties, his immense magic control and power along with weaker but nonetheless present immortality at his disposal.
Secondly, i did not alter any of the great sage abilities since they need to remain the same to give him the edge after all abilities like thought acceleration, parallel processing and chant annulment will cone in handy and provide a major but acceptable boost to his magical abilities.
Thirldy, as said by God himself that some of his abilities will either be sealed, adjusted or be slowly awakened to match the narrative
Lastly, please read this book with an open mind if you wanna really get into well
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I will strive hard to release as many 20 or so chapter soon enough and depending how you guys fell about the stories growth and potential will i use to make my decisions going forward