Shinmai Ossan Boukensha, Saikyou Party ni Shinu hodo Kitaerarete Muteki ni Naru.  

新米オッサン冒険者、最強パーティに死ぬほど鍛えられて無敵になる。, Shinmai Ossan Bouken-sha, Saikyou Party ni Shinu Hodo Kitaerarete Muteki ni Naru, The Middle-Aged Newbie Adventurer, Trained to the Brink of Death by the Strongest Party, Became Unbeatable, The Ossan Newbie Adventurer, Trained to Death by the Most Powerful Party, Became Invincible

It is generally advised that individuals become adventurers at a young age because the magical power required for an adventurer's strength will not develop properly if it is not trained during this time. However, there are exceptions, such as Rick Gladiator, who became an S-rank adventurer despite starting his journey later in life. Despite being over thirty years old, Rick possesses the combat power of an elite adventurer due to his training with legendary Orihalcon Fist members and their "monster" mentors. He has faced challenges from dragons to vampires and emerged victorious, proving that age is just a number when it comes to being a successful adventurer.