Statistics on R&D Activities in the Public Administration Sector Indicator 9.5.2. Researchers (in full-time equivalent) per million inhabitants Number of researchers (in natural persons) per million inhabitants by age Unidades: Investigadores (en personas físicas) por cada millón de habitantes ,2023,2022,2021,2020,2019,2018, All ages,"",5.633,5.390,5.146,5.133,5.025, Under 25 years old,"",762,723,570,658,611, From 25 to 34 years (current quarter),"",11.980,11.051,9.849,9.775,9.346, From 35 to 44 years,"",10.492,9.896,9.355,9.235,8.965, From 45 to 54 years,"",8.702,8.577,8.512,8.388,8.372, From 55 to 64 years,"",6.909,6.604,6.726,6.688,6.561, 65 and over,"",1.029,977,918,918,912, Notas: Fuente: