yes i know it infects children, in my 68 yrs on this earth i have never had RSV, including when i worked in a hospital peds floor.
If we had RSV, when we were around age two our parents wouldn’t have known what we had, decades ago.
My sister, who is now 82 at age 2 , was put in the hospital (before antibiotics) for two days/nights and recovered.
She never had the flu, any virus or pneumonia after that event. She feels that she had RSV decades ago, and it made her immune to many later viruses from her children.