How do you roll back a penis foreskin?

For most men the foreskin can simply be rolled back by gentle sliding it back. Other men have a tight foreskin that may be harder to roll back or that may not be able to be rolled back at all. The foreskin of infants and young boys generally do not retract. While some boys may be able to retract their foreskin by age 3, others will not be able to retract their foreskin until puberty.