Wheat is the mainstay almost everywhere and even asians eat some.

Back to the subject; men in this country used to father children in old age but now impotence is the norm.
Maybe if they could get an erection....

Also don't forget that in India, veganism is not the norm. Dairy is highly valued so there's still animal protein involved.

Many women give birth easily and age is not necessarily the factor.
Even young women in our country have big/huge babies due to diet...not necessarily so everywhere.