Data from other statistical authorities
While the sample in the Future Study back in 2010 consisted of four age groups: 50-54 years, 60-64 years, 70-74 years, and 80-84 years, the sample in 2021, as in 2015, covers all eight five-year age groups within the range of 50-89 years.
https://www.dst.dk/en/TilSalg/Forskningsservice/Data/Andre_Styrelser