Women mature faster than men. Most women in their 30s or 40s have been acting the exact same for 20 years, only difference is that they have more mental issues due to cultural/corporate/college brainwashing, and from dealing with loser men their whole lives.
I have had so many negative experiences with older women (meaning older than 23-25) that I'm pretty much turned off indefinitely from them until I see otherwise. When I'm in my late 30s and 40s I plan to stick with the younger women even if that means limiting my options.
The only problem I run into with younger women is naivete which can be a big turn off, but it's not actually that common.
My friend started dating a 19 year old in his late 20s, and she was one of the coolest and most mature women I've ever met.
Most women hit peak maturity by their early 20s and don't accumulate any more wisdom or sanity for the rest of their lives.