Now a large professional organisation with more than 3,800 employees working in scientific, medical and support services. Blood Service is remarkable in that its very existence depends on the continued support of more than 520,000 generous Australians who give their time and their blood as a gift or donation. If you are aged between 16 and 70 and feeling healthy and well you may be eligible to donate blood. It only takes an hour of your time and every donation saves three lives.