Healthy aging delays plasma clearance of ¹³C-DHA as adapted from Plourde et al. (2011). In the elderly, plasma tracer concentration in free fatty acids (FFA) and triglycerides (TG) was 4-5 fold higher 4 h after giving the 50 mg oral dose whereas in phospholipids (PL) and cholesteryl esters (CE), ¹³C-DHA was 2-fold higher 1-4 weeks later (Young: 26.8±2.6 years; Elderly; 76.5±2.7 years).