Age and weight rules for blood donation depend on the laws and guidance of each country and the policies of the donation centre. Below are common patterns and practical notes.
Minimum age
Many countries set a minimum age of 16 or 17 with parental consent, or 18 without consent. Some places allow 16-year-olds to donate with parental permission; check your local service.
Maximum age
There is often no strict upper age limit as long as the donor is in good health and meets other criteria. Older donors may be assessed individually and may need a doctor's approval depending on local rules.
Weight and health
Donors must usually meet a minimum weight (often around 50 kg / 110 lbs) to ensure donation is safe relative to body size. Certain medical conditions or medications can lead to deferral.
Check local rules
Always check your national blood service or donation centre for exact eligibility rules and any age-specific requirements.