Wow, reading comprehension is very low amongst the piggs today.
But if you will not take this Counsel, and persist in thinking that Commerce with the Sex is inevitable, then I repeat my former Advice that in your Amours you should prefer old Women to young ones.
Ben is clearly advising the reader to marry, but if you’re not going to do that, have your fun with an older woman.
He is NOT saying to marry an older woman, nor marry and then get a mistress, of any age.