There is no any maximum age limit for sexual intercourse. It totally depends on the person who wants to have sex. It’s quite natural that, sexual urge is comparatively less in old age due to decreasing amount of testosterone. If one is suffering with physical and psychological ill health and stress in old age may leads to problems like, lack of interest in sex and early ejaculation. Proper diet and exercise helps. One can have early ejaculation in any stage of life. Please read article on link below for more information on early ejaculation.

https://letstalksexuality.com/premature-ejaculation/