As France is expected to have 20 million people aged 60 and over by 2030, the economy for seniors could generate a turnover of more than €130 billion by 2020. Three projects, developed through the Polytechnique Accelerator or led by students, have chosen to specialize in silver economy. Auxivia, a start-up accelerated at l’X in 2015, is developing a medical service for elderly patients and nursing staff. The company uses intelligent lenses to offer an automatic and reliable hydration tracking and traceability system for nursing homes and home care services. Wandercraft, a project launched in 2012 by three Polytechnicians, develops an exoskeleton of the lower limbs for use by paraplegics, people with myopathy and the elderly. The start-up FeetMee, created in 2013 by two l’X alumni, is developing connected soles with pressure sensors to prevent foot ulcers for type 2 diabetics with diabetic neuropathy.