This research article found that older surgeons get increasingly better results — even into their 60s. Roughly: on average a 60 year old surgeon is better than a 50 year old surgeon and a 50 year old surgeon is better than a 40 year old one. Of course, articles based on it were widely shared by older people who wanted to point out that the experience of older people is undervalued.
Put aside whether you like this particular article or not. Is it from a reliable source? Investigate the issue and state your evidence for seeing this source as reliable or not.