Similar title to Scherbov, S. ORCID: https://orcid.org/0000-0002-0881-1073 & Sanderson, W. (2020). New Approaches to the Conceptualization and Measurement of Age and Ageing. In: Developments in Demographic Forecasting. Eds. Mazzuco, S. & Keilman, N., pp. 243-258 Cham, Switzerland: Springer. ISBN 978-3-030-42471-8 10.1007/978-3-030-42472-5_12.