@Guineapigbridge
The first year should be a search for red flags (on both sides): violence, inability to forgive small mistakes, inability to resolve conflict with talking, a tendency toward dramatics or sulking, lack of motivation, poor relationships with exes, poor relationships with kids, drug or alcohol misuse, boringness, depressive traits, tightness, bad financial decisions, sexual problems like excessive porn use etc...
100% this. A shocking number of women out there ( just look at many of the threads on here for example, and even a couple of posts on this very thread...) don't consider these things properly early enough in the relationship. Then think nothing down the line of tearing their future family apart for things they should have split up for much earlier.
Dating should be fun, but it's complete madness not to be discerning long term compatibility at the same time.
From experience, the majority of men who are serious about having families have already settled down by early 40s. Many men in their 40s who say they want a family "one day" are either not serious about wanting a family and are just saying so to selfishly keep the woman hanging on since they know it's a deal breaker for most women, or they have unrealistic expectations about a partner so never actually committed to someone. Go in with your eyes open and have open conversations about it with him (1 year is not too early if the guy actually sees a future with you). Because if you want kids, you absolutely can't waste time on someone who will string you along.
At your ages, and being in a one year relationship, I would expect by now, there would be more of a timescale from him of "within the next X years I would ideally like to have kids". If he genuinely wants and is excited by having kids that is....