Late to the party, but that's when the cool stuff starts happening, right?
Disclaimer applies: I really want you two to have some great adventures. Don't ask me why, but for some reason I feel invested here so I'm going to be more nitpicky than I normally am. Remember it all comes from a supportive place.
Pictures: I get they're a work in process, but if they're not flattering, get rid of them. Lose all pics of M except the boat pic. The rest look awkward or are unflattering. Keep J's crocheted coverup pic, the eyes, bathroom selfie (I normally hate them but that one serves a purpose), beach pic (tattoo) and the bed pic with the towel animal. Fill in once you get the photoshoot done.
Why keep the bathroom selfie? There's some stretch marks that will help older women feel more comfortable about the idea of being naked with a much younger woman.
There's some creative wordsmithing I like. Funships is a good one. I like the questioning approach of the first paragraph. Keep those.
Having said that, the sentences about pace and process in the first paragraph feel out of place. The feeling I get is you're trying to communicate that you're open to whatever happens, so maybe reword it from that perspective. I'd probably include some expression of experience level since without that the wide-open approach you're expressing can come across as desperate. That will make the difference between "Let's play" and "Will someone please fuck us"?
"Finding a woman that she can become friends with, that is open to showing her the ropes (so to speak)" isn't a complete sentence. Same with the next one. There's a few more scattered throughout, so find and fix them. Their presence contradicts the educated persona being presented.
Descriptions: Agreed, lose the first paragraph. Yes, women have an issue bringing a younger woman into the bedroom. The two main reasons from my experience are they're going to be in much better shape, and they won't have any thing to talk about. Mrs C. did so unwittingly recently (happy birthday to me!) and is now a bit more comfortable with playing with someone half my age, but that's a rarity. What let this younger lady slip under the radar was the way she carried herself...she came across much more mature than her chronological age. I'd definitely follow the advice of emphasizing J's maturity, and what she has in common with more mature couples if that's true.
Hope all this helps!

