A Young female friend of mine will visit Amsterdam this summer. She want to find an elderly man to have some fun with. Where can she find an older male Escort. Is the best way to go to a swingers club or is there any other way for her to get a happy evening?

"Older male escort", I'm sure quite a few of the members here will be lining up (8~>).
Alternately, you could try http://www.kinky.nl

From a previous post of yours it seems you are a young man who likes elderly women and you have a young female friend who likes elderly men. Pretty amazing coincidence.