The branch of medical science which deals with the problem of the old:

Geriatrics (adjective)Meaning: The branch of medicine or social science dealing with the health and care of old people.Bengali meaning: বৃদ্ধদের চিকিৎসাব্যবস্থা।The meaning of other words:Endocrinology - The branch of physiology and medicine concerned with endocrine glands and hormones.Oncology - The study and treatment of tumours.Obstetrics- The branch of medicine and surgery concerned with childbirth and midwifery.(ধাত্রীবিদ্যা।)Source: Oxford Dictionary & Bangla Academy Dictionary.