What Is The Average Length Of Intercourse And Ejaculation Time After 53 Years?

Question : My 53 year old, very healthy boyfriend has insecurity about his sexual performance. I have repeatedly assured him that he is a fantastic lover: caring, affectionate, skilled at cunnilingus & usually able to ejaculate 3-4 times (without loosing his erection) over 20 minutes of intercourse. He recently became a recovering alcholic after an achohol induced break-up of his 25 year marriage. I beleive his insecurities are caused by XXXXXXX feelings of guilt over his poor performance as a spouse and father. I reassure him that I am VERY satisfied. Recently I heard on the radio, that most men, over 30, average about 10 minutes of intercourse and one ejaculation. IS THAT CORRECT ? He seemed to be more assured by this statistic than my personal assurances. Also could you give me some "averages" for male performance over the age of 30 ?? I would like to offer him more statistics to reassure him.
I know that every man is different and there are drawbacks to statistical info. I am convinced that his performance is obviously ABOVE AVERAGE, so that statistics will provide realistic measures that he can compare himself to; rather that his own fears.