„On average across OECD countries, 37 % of primary to secondary teachers were at least 50 years old in 2015, up from 31 % in 2005. At the same time, the teaching profession is increasingly unattractive to students. Teachers’ salaries are lower than those of other, similarly educated full-time workers.“
OECD (Hrsg.), „OECD Skills Outlook 2019“ (2019), S. 204