In the US about 25% of adults 65+ have no remaining teeth left (2020 data).
https://data.cdc.gov/Oral-Health/Adults-aged-65-who-have-lost-all-of-their-natural-/vzr2-2rzq
The 2023 figures for the UK are
4% among 65 to 74-year-olds and
11% for those aged 75 and over.
https://www.london-now.co.uk/news/25936137.dental-implants-over-60s-age-bias-problem/
Adults aged 65+ who have lost all of their natural teeth due to tooth decay or gum disease (by Race) | Data | Centers for Disease Control and Prevention
2012-2020 (even years). Data from BRFSS for indicators of adult oral health for even years from 2012 through 2020. National estimates are represented by the median prevalence among 50 states and the District of Columbia data. Estimates are prepared from the BRFSS public use data sets. Estimates in this file are not age adjusted, and may differ slightly from estimates available from the BRFSS web site or Chronic Disease Indicators due to small differences in definition, age adjustment or rounding. For more information, see: http://www.cdc.gov/oralhealthdata/overview/Adult_Indicators.html