It’s not true that the quality of girls will decrease as you get older. If you’re serious about increasing your money and status you’ll have an abundance of hot women in your life basically until the day you die.

I think maturity often might be correlated with decreasing T, but is it a cause?

Saturation with happiness and achieved goals [having it all] might be one of the causes why top people are often accused of being pedos, are they looking for new challenges?

Would she drop everything and go with you to live on sparely populated small island? Would she put on a hijab? I know these q are taking it far, but what are the answers. How do you like theoretical answers.

Sounds you want to answer yourself a question, what do I want now - now that I feel fulfilled [except marriage and baby].

Did you hide / secure assets.

I have the option to see other girls of course, but I don’t always make the effort to do so. I’m always aware of the time and energy it takes which I would rather use somewhere else.

If you consider dread as a necessity--which you should--then keeping up options is non-optional maintenance. Consider rewording your complaint here about diet, exercise, or limiting your drinking. Your response should be obvious and immediate. (But exercise takes so much time and energy! I don't feel like doing it! Why can't I just ignore the damage being a slob and eating Cheetos will cause! Waaaaaah!)

I just can’t shake the feeling that I am getting too comfortable and using it as an excuse not to push myself to grow further.

You're probably right.

Is that an excuse? Or is it a maturity?

It's laziness.

TLDR; I am in a happy open relationship. Should I focus on that more or continue to play the field?

This relationship will end. How long have you been seeing each other?

I'm in the late stages of a long, happy marriage. 5 years older than you. The next stage in life for men, after finding a suitable woman and getting your finances handled, is to work on their legacy(kids). After you've done that you reach a level of maturity where it's fun to have a new pussy once in a while but you have your main one. If you learn red pill and apply it your main woman will keep your balls drained and it's not even worth the $30 to go fuck a whore, let alone the pain in the ass of dating.

After the kids grow up your main woman will retire from motherhood and her SMV will plummet to zero, she'll hit menopause, and it's basically over in terms of sex. I plan on letting my wife go do her charity stuff and take care of her parents while I take on a 2nd wife. Some time down the road her parents will die and we'll be the grand parents getting taken care of by my new wife and our kids. I've thought a lot about this and decided that it would be best to get one of those retired hoe leftover women in their 30s from a country that has good divorce laws. She'll be good at sex and not want kids but be grateful to have a husband. By the time I'm 70 she'll be at that plummeting SMV and menopause stage and then I can die :).