Fathers in England are getting older. In the 1990s, they were 31. Now, they are 33.
Younger fathers have healthier children, so this is a problem. One British doctor has a solution. He suggests that young men freeze their sperm. When the man is old, and he wants to have a baby, he can use his frozen sperm.
Difficult words: solution (something that you do to solve or stop a problem), suggest (to say), freeze (to make really cold), sperm (the things which come out of the penis when men have sex).
