Martial arts can be a safe, rewarding, and physically beneficial practice. There is no reason to suffer debilitating injuries to enjoy its benefits or acquire its skills. However, you should be comfortable accepting the element of risk associated with your practice of Hapkido.
Your age, health, conditioning, and athleticism all influence the level of risk. If in doubt, speak to your instructor and obtain medical advice.
Be aware of limitations or existing physical conditions that may affect training. Advise your instructor, and never do anything in which you do not feel comfortable or safe.
Remember, you are the best judge of your own limits, and the one who must live with the consequence of your actions.