MTL - The Father of Superheroes - Chapter 614 superhero association

In the year 298 from the era of the gods, elementary school girls Sumi Washio, Sonoko Nogi, and Gin Minowa are tasked with an important mission. They are to become heroes and fight Vertex, a mysterious enemy that is attacking Shinju-sama, the god tree that protects Shikoku, the only area in the world that is still habitable. What they don’t know, is that this fight will cost them more than they could have ever imagined.

In 2040, The Earth was bathed in powerful radiation when a star went supernova, this radiation granted 50% of humans superhuman abilities but also created a nightmare for them as animals, insects, and carnivorous plants were mutated and became overpowered with intelligence, human started teetering on the brink of survival, a boy with no powers and no father, with a mother in a coma, seems destined for obscurity, but one night changed his life, with a new found hope to cure his mum from the everlasting sleep—Gene Elixir— he went on on a journey that would reshape his destiny...~Voracious Sovereign... Gene Devourer...Pray you won't be devoured by this power you wield which hunger is insatiable~~You call yourself an opportunist... But... you aren't free. A hungry man is not a free man...~

Once she woke up, Su Tingyun had become a 70 year old granny.

After resigning to her fate with great difficulty, deciding to become a rich family’s esteemed mother and residential big boss, she didn’t expect that the scenario would change again.

That husband of hers who had died on the battlefield was now the cultivation world’s deity, and sent people to pick her up for celestial cultivation?

Fine, she’ll cultivate, but how did she accidentally cultivate into someone else’s body?

Changing old patterns up and playing swapping the frame…

Young man, granny is 70 this year, is your taste heavy enough?

- Description from Novelupdates

Lingyun, a fierce and savage cultivation genius takes over a dead teenager’s body. Coincidentally, they are both named Lingyun. Set in a alternate version of the 21st century, teenager Lingyun has been killed by someone with a grudge.