Blood donation saves lives, as confirmed by the testimony of a patient who received transfusions every two weeks. Most countries face problems in maintaining sufficient supplies of blood products according to patient demand. Demographic changes in China predict a 16% decrease in available blood products by 2036, while demand will increase. The number of donors in China has increased from less than 10 per 1,000 people in 2008 to 11.5 per 1,000 people in 2022. There are various ways to increase the blood supply, including changing the maximum donor age - for example, in France, people over 70 can donate. The study by Liu and colleagues examines blood donation within the broader framework of incentives to increase donation.