Disclaimer: After 23 years of marriage and 9 years as a divorcee, I'm not a great fan of marriage - - so please bear that in mind. Plus, I realize that most people will not agree with my opinions! That's all that these are - - no "ultimate truths", just opinions. YMMV
Unless you are sure that you want to have kids and young enough to do so, I'd suggest thinking long and hard about whether or not you want to marry at all. If kids are desired, then marriage is something you will probably want to do for them, so ignore the rest of this post.
Marriage and emotional commitment are not synonymous. You can have one without the other.
I believe that marriage is a financial arrangement. Think about it - - have you EVER heard someone say, "I really made out in my divorce, and I've never had so much to spend!" The truth is that marriage is a financial arrangement that blows up during divorce, and so often both sides make out poorly in a divorce. Divorce is sheer financial catastrophe, and can really mess up your life. It can take years to get your credit back and get back on sound financial footing. Is that risk worth taking? (no, probably not)
If you don't divorce, often one partner (unknowingly and without meaning any harm) takes advantage of the other in a financial sense - - for example, the guy who spends his wife's entire salary on his flying lessons, or the wife who spends money on decorating or little ceramic thingies or the mall faster than her husband can bring it in. If you are the frugal one in the household, guess what? You might just be working and saving while your spouse is busy spending faster than you can make it. And since people change during their lives, the balance of financial power in your marriage may shift back and forth, too.
I am so happily divorced. Although initially my credit was ruined, by now I am amazed at how much money I have compared with what I had in married life. My present companion (boyfriend?) is a widower, also in his fifties. We have been together six years and have more emotional commitment than my ex and I had (especially after the first year or two of marriage). We have no plans to marry or to live together and we love it that way.
Instead of slaving over a hot stove, I get taken out to dinner. Instead of dirty laundry, I get thoughtful little gifts. And he doesn't exactly miss his list of "honey-do's", either (I hire people to do that sort of thing, or do them myself). I wish someone had told me not only to think about WHO I was marrying, but if marriage was necessarily something I want to do.
I don't see any reason to seek state sanction of our love and commitment.