So long as the two parties involved are willing and want to be in a partnership then I am sure it works no matter what age. However if one is entering into the arrangement with other than a sincere wish for it to work, then nothing, no matter how many compromises, will make it work.
Am now on a long term relationship  and couldn’t be happier. 1 – husband died unexpectedly on his way to see his son, 2 was a manipulative marriage and despite my best efforts it was meant to fail. 3 couldn’t be happier after 36 years. So this author’s work is still dependent upon the people he is assessing to get his results.
Published 7th April 2020