I opted out of the ability to have kids and am in a long term relationship with no intent to marry, unless a legal reason suddenly appears. I’m in my late 30’s and have I do have many friends who have gone down this route, some are more mature, successful, and/or happy than I am and some are not.
I’m a big advocate of those things not being a thoughtless choice, but something that a person takes a long time to think about before they try for either one. I’ve met way too many people who either, while they love their kid(s), don’t like how their life turned out because of them or are miserable in their marriages and will likely get a divorce.
Which means twice the savings when you unexpectedly lay them both off!