Hi, ETP!
Welcome on board.
I don´t know what to recommend you. I´m a newbie, and also don´t have a significant other, so this goes beyond my knowledge.
However, i would suggest you to read some thereads that you may find specially informative:
The Snook’s big book o’ pheros for rookies
Updated AndroticsDirect Pheromones for newbies
An Introduction to Mones; Names, Size, Strength, Use, Effects & Length of
Also, How do I qualify for a $25 gift certificate?
I think that the combos PheroJack already suggested you may work fine.
Also, the advice happycarol gave you seems very appropiate if you think she will be receptive with the whole mones thing.
I wish you luck with your research. It´s always great, and unusual now a days, to see a couple that, after such a long marriage, still cares.
Hope this helps.
Talk to you soon.