Although testicular cancer is most common among men aged NUMBER@1 -- NUMBER@2 years , it has three peaks : infancy through the age of four as teratomas and yolk sac tumors , ages NUMBER@3 -- NUMBER@2 years as post-pubertal seminomas and nonseminomas , and from age NUMBER@4 as spermatocytic seminomas .

It is most common among males aged NUMBER@5 years .
