i would consider it a well-known fact that there is a link between cohabitation before marriage and higher rate of divorce.
granted, divorce rates are rising anyway. but to be totally honest, if OP considers this boomer talk, it just speaks to lack of insight and life experience (which you will get when you move in with someone, to be fair). also, looking for an exact number to reach some kind of threshold just seems like a cry for validation. you certainly don’t need to gain approval from people on the internet to make a decision (myself included). you won’t need to know a number when you’re ready, because you’ll know the time is right.
regardless of what i said, i hope you find further research on the matter (try using pubmed or national institute of mental health resources) and i hope you find happiness if you’re taking that next step in life.
would the suggestion be to have the post title in the URL?