I wss 40, and my close friend's four monfh old was terribly upset, and nothing she would do would calm him. So I took him and quietly put him to my breast and he started sucking immediately. I wasn't lactating but he continued sucking till he fell asleep.
It was a most joyful feeling I had. Never had a baby suck me, and I can still "feel" his tiny hand gently pressing and caressing my left breast as he found solace in it. He is the only child I've ever soothed this way: an experience I'm not likely to forget ever.