Re-Employment of the Former Strongest Hero is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Dan was “the strongest and bravest” when he was young. But because of his lazy life, he is now a divorced, unemployed old man! He tries to earn money through quests for a living, but age has taken its toll on his strength and all that! He was approached by a silver-haired elf, a handsome man, and an S-rank adventurer… a young man of today’s generation!