Do I need to guard machines pre-dating the formation of OSHA?

Regardless of machine age, all machines shall have machine guarding as a way to mitigate hazards for protecting operators and others in the area. Legacy machines can be challenging to properly integrate safety features, especially when designed without guarding in mind. However, all employees shall be protected from danger by making the machines safer no matter the age of the equipment. This equipment may require controls upgrades, it may require creative modern technology, or it may only allow for a shared responsibility between engineered solutions and administrative controls due to the interaction for machining and production requirements.