Take care of your great-grandchildren!
The mortality of descendants turned out to be dependent on the age of fathers, grandfathers and great-grandfathers
Other doctors and scientists have harshly criticized Smith's idea. Spermatozoa do not tolerate freezing well and eventually lose the ability to fertilize eggs — and therefore middle-aged and elderly men will have to depend on the IVF procedure, noted andrologist Alan Pacey (Allan Pacey).