Many of the drugs that individuals are on for 40 or 50 years have only been on the market for the past five decades, so their long-term effects on the body are still unknown
Is that a typo? Because it sounds like we do have 50 years of data.
I hate when the way numbers are represented changes in an article. It feels slightly dishonest to say “50 years” in one sentence and then “five decades” in the next.