Most hospitals recommend a minimum age of 18 for kidney donors, not because younger kidneys are too small, but because individuals under 18 are minors and cannot legally give informed consent. Additionally, some genetic kidney diseases may not show symptoms in young children and teenagers, making it difficult to determine if their kidneys are affected. There is no upper age limit for kidney donations. Donors over the age of 60, 65, or even 70 are considered on a case-by-case basis. Between 1998 and 2017, 2,337 people over the age of 70 donated kidneys, and the number of donors in this age group is increasing. As of 2021, the oldest organ donor was 91 years old. Surgeons decide based on the potential donor's health and kidney function. Conditions like high blood pressure, diabetes, or being overweight may disqualify someone from donating. Even without health complications, the final decision rests with the surgeon. Studies comparing older kidneys (from donors over 50 or even 70) to younger kidneys show minor differences. Younger kidneys tend to work better long-term, but recipients of older kidneys have similar survival rates five years post-transplant. The risk of complications and organ rejection is the same across all age groups. The takeaway is that kidneys from older donors can function well, but younger recipients might prefer younger donors.