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Maymay - to answer your original question: Yes, incontinence rates have increased. I found this study that looked at the increase in rates from 2001 to 2008 in the US significantly during that time. (
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3197263/) Speculation on the reasons are an increase in obesity and also in conditions like diabetes, which can contribute to incontinence. I know that you had asked about the increase from the 1950's to date, and this specific study looks at only a period of about 8 years, given the continued rise in obesity and diabetes, I would speculate that the prevalence of the condition has indeed increased since the 50's.
If any of you ever need anything, or have a question, like MayMay did, please don't hesitate to ask. We may not have the answer for you immediately, but we'll do our best to get it to you as soon as we can!