“…Some find elevated levels of loneliness among adolescents or young adults, lower levels in mid-adulthood, and increased levels again in old age ( Lasgaard et al, 2016 ; Mund et al, 2020 ; Victor and Yang, 2012 ), that is, a U-shaped relationship between age and loneliness. Others find that loneliness decreases linearly with age ( Barreto et al, 2021 ; Beutel et al, 2017 ; Tonković et al, 2021 ), and some that it increases ( Hansen and Slagsvold, 2016 ; Hutten et al, 2022 ). The U-shaped relationship has been found also in some studies about specific age groups, for instance among students (18–35 years old) ( Hysing et al, 2020 ) and middle-aged to older adults (aged 50 years or more) ( Pinquart and Sörensen, 2001 ).…”