I know as much about angels as I do of jinn, which is next to nothing.. but will say this much, during the last ten of Ramadan, there is one Mosque in particular which I can honestly say I believe the angels to be walking along with those who enter.. it is a strange feeling like no other and I don't have an adjective for it.. I was even told so by a kaffir friend completely out of the blues, basically vocalized that strange peaceful feeling...
Maybe children can see them but I don't know...
I know that I read once an incident of a young man who was to visit his friend and he met with a very handsome person on his way too, who asked him where he was headed, the young man stated, I am going to my friend, the handsome man asked him, why do you need something from him? and the young man said, No, I simply love him in Allah, and so he was told in return that he is loved by the one in whose names he loves .....
don't ask me to validate the story but I believe it to be true insha'Allah..