Damn just realized I'm an older guy now, so I'm qualified to answer
In my experience, older women are worse in practically every way. I don't just mean 30s and 40s (lol) and up, I mean even the difference between 21 and 25.
Here's what it comes down to: younger women are more beautiful, more feminine, more fun, and less jaded by being ran through by a bunch of dudes. So basically all the things we care about, are better, on average, when they're younger.
Older women become the opposite: more serious, actually harder to game even though they're less attractive, and more jaded.
We were doing some calculations in another thread saying that an average 25 yr old in a big metropolitan city can realistically have a bodycount anywhere from 10 - 30. What do you think this bodycount is at age 30? Age 40? And then there's the question of, do you want to deal with a single mom? That's some serious "smash only" zone, but they'll try and make you work extra hard for it because they need a male provider as well. Sadly, the only easy smashes I've had of women 35 and up are those that were cheating on their partner. Because in this case they already have the provider at home..
Also the sex is worse as they get older, no matter how much they're into you. At 33, the puss just isn't working as well as it does at 23. Women evolved to be reproductively relevant basically from somewhere in their teenage years until their early to mid 30s - apparently 90% of their eggs are gone by age 30. One of my recent plates was a 40 yr old fitness instructor, basically as hot as possible for a woman that age, and she would treat me amazing and make everything super easy. And I still prefer the kinda average 22 yr old chick.
So that's my experience. Overall age makes them lower value in pretty much every way, but somehow this doesn't translate into them being easier to smash, so it's literally the worst of all worlds haha.