Ossan Boukensha no Jimichi na Isekai Tabi

An old man who is tired of his slow body leaves the youngsters across the country in the dust as he transfers to another world.
But you know? It’s a little too late for that! What am I supposed to do!?
Just then, the god offered him a single lifeline. His one ray of hope is a skill that allows him to slowly grow younger.
And with this small hope, the old man begins his journey.