If you're looking for manga similar to A Bride's Story, you might like these titles. All recommendations are made by Anime-Planet users like you!
When speaking of older female x younger male romance with considerable age gap there are two series that stand out. First is Otoyomegatari which has probably the best take on the subject in seinen manga ever. Second is Kumiko & Shingo which may appear similar to it's shoujo peers, but stands out due to it's length and the fact that the story spans many years.