“…The modernization hypothesis surmises that with educational expansion, upward mobility, urbanization, improved transportation, new communication technologies, individualization and secularization, intergenerational proximity, inclusive of coresidence, must decrease (Choi et al, 2020; Kalmijn, 2021). Consistently, in the 21st century, the transition to adulthood and its associated milestones, such as marriage, childbearing and homeownership, have happened at increasingly older ages (Gillespie & Lei, 2021; Kye & Choi, 2021; Maroto, 2017, 2019; Mazurik et al, 2020).…”