Old timers from the Baltic Sea: Revisiting the population structure and maximum recorded age of ide Leuciscus idus

•Population age structure of ide was complex and varied between sites.•A new maximum age of 29 years was recorded for ide using otolith thin sections.•Growth in length practically ceased at ca 10 years of age.•Higher growth rates were recorded compared to historical datasets from the same region.•Highly positive relationship between age and otolith weight was observed.