Let's say you're a 23 year old man who impregnates a woman. Will your genes be the same if you were to impregnate another woman at age 35? Will your genes in those 12 years have changed/mutated/become-smarter ?
One will definitely find differences in genes that a man impregnates a women with at 23 verses at 35. Our genes are changing everyday. After one is an adult the changes in genes are due to environment and lifestyle. Some of the changes can be very obvious and be seen in the next generation. Some of the genetic changes are forgiving and do not present themselves in the next generation.