I'm 36, I went to a party on the weekend because one of my mates is having a kid (year out of leaving his wife too), another had two kids, a few others had kids. No thanks. I had the chance in the past to be tied down and married a few times which would have ended up with kids and I would not be in the position today making the money I am and being able to still train if i'd done that. I wouldn't have the money and would be fucking stressed out big time, probably not training much, wasting time on bullshit things I don't want to do. But it's up to you everyone is different.
^^^
Prime example of what I'm talking about.
My gym has child minding. As soon as your kid can hold his or her neck up, you can take them. I would train every morning, take my daughter to the park, feed her, etc. I live in Canada and took some time off for parental leave. But before that, the ex would take care of our daughter. I was able to work, train, party on weekends, do whatever. It's way different if you're a single parent, but if you have two grown ass adults, how the hell can you not be able to take care of a child? It's not that difficult. And if you have family members or friends with kids the same age, you can easily reclaim a lot of lost time. Family members are usually eager because being an aunt/uncle or grandma/grandpa is super rewarding and no drain at all.
The only thing I would caution is the relationship... I'm now divorced and half of my income goes to my ex. You're gonna be stuck with the mother of your child for almost two decades - THAT is the only thing I'll caution you about. Women are all crazy though, so that should go without saying.