MTL - Nautical Explosive Soldiers: The Five Elders, How Many Divisions Do You Have? - Chapter 100

After being fired, Lu Qingjiu finally decided to return to his hometown to farm.

At first, he started raising a pig, and then he found that the pig could solve more high-level math questions than he could.

After that, he started raising a flock of chickens, and then he found that his own fighting ability was one-tenth of that of a single chicken.

Finally, Lu Qingjiu finally realised that this old home wasn’t quite right… Especially a certain person by his side who constantly stared at him day in and day out.

Lu Qingjiu: “Are you drooling because of the spicy stir-fry I’m holding or because of me?”

Bai Yuehu pointed at the stir-fry.

Lu Qingjiu: “Then can you let go??”

Bai Yuehu reluctantly glanced at Lu Qingjiu’s arm, before loosening his teeth.

- Description from Novelupdates

Crossing to One Piece world, he became Roger’s younger brother.

King Grey has unrivaled strength, wealth, and prestige in a world governed by martial ability. However, solitude lingers closely behind those with great power. Beneath the glamorous exterior of a powerful king lurks the shell of man, devoid of purpose and will. 

Reincarnated into a new world filled with magic and monsters, the king has a second chance to relive his life. Correcting the mistakes of his past will not be his only challenge, however. Underneath the peace and prosperity of the new world is an undercurrent threatening to destroy everything he has worked for, questioning his role and reason for being born again. 

Jacob Steve, an Old Man, died at 116 after living a whole life.

But Jacob always had a dark side, which he always suppressed and hid from others.
However, in the later years of his life, when death was inevitable, he understood there wasn't any point in having wealth, knowledge, or desires if you couldn't have a life to enjoy them.

He became obsessed with fabled immortality and devoted his reaming life to extending his fleeting lifespan, but just like any other failed.

However, he mysteriously got another chance at life and found a way that led to fabled immortality.
But he was also forewarned that the way led to it was filled with blood and darkness!

In the end, Jacob chose it anyway with no way of going back, and it was also the start of his suffering and his icky, brutal journey toward the 'Immortality' he wanted so badly!