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Generally, you find people blaming the 7th house or Venus for delay in marriage. But in my experience of two decades, primarily in the last few years, I have seen where a person's extra focus on the 10th house (house of profession), Moon (mother), Sun (father), Mars, and Jupiter (siblings) also become reasons for delay in marriage. Don't draw a general inference or get perturbed, but it is true in many cases. A good astrologer looking at the person's horoscope can identify all such reasons specific in each case. Once you know the exact reasons for late marriage, you can fix these reasons better.
https://www.mid-day.com/brand-media/article/reasons-for-late-marriage-23242701