In India, some saints or seers says that if lord Shani has dristi ( sight) on your 7th house the marriage will be delayed.
The current aspirational India is seeing people devoting their 24-25 years of life to education and then another 3-5 years in finding job and achieving financial independence. This is one of the cause of rise in average marriage age in India.
I am of opinion that after this settling down financially also, people are taking much time to find the partner. The reason being that divorce is still seen as something taboo or socially awkward. The marriage is still seen as one time activity in Indian youth which is creating tremendous pressure to make a right decision.
Many a times people are faltering after years of relationship before marriage on grounds that we are great together but our families are different, it is not practical and others.
As a society we take pride in our long lasting marriages and tightly knitted families, but somewhere it is stopping or slowing down our choices. A safety net which is acting as cage many a times.