Try saying why you irrationally fear an arbitrary point in time.
Lacking a marriage
You haven't made it a high enough personal priority yet, then. The real reason I didn't marry earlier than I did is because I was essentially passive about it, because ego. The same is probably true in your case. You need to take a hard, long look at yourself and determine just why you aren't attracting the type you want. It's not about criticizing you, it's about deciding whether you're willing to grow what you can and will do to that end.
There's a 70 something year old woman near me who did parkrun in 23 minutes. Sometimes you can be older but supremely healthy or young looking. Look at Jared leto.