23 Apr Noticing a change in the amount you ejaculate, or your semen volume, of underlying conditions that can result in a low ejaculation volume. I have discovered lately that during sex I ejaculate a very small amount of semen. I am 54 years old and I remember ejaculating a lot of semen. Q: “Dr. C, I've always [believed that my] ejaculation and my semen volume has always seemed small. I'm wondering if there is anything that I can do.