According to the 1991 Census, the highest percentage of population in India is to be found in the age group of

1. The question asks for the age group with the highest percentage of population in India according to the 1991 Census. 2. Censuses provide data on the age structure of the population, often presented in age pyramids or tables. 3. India's population structure has historically been characterized by a large proportion of young people, typical of a developing country with high birth rates in the past. 4. In the 1991 Census, India had a very young population. While precise percentages for the exact groups listed might require consulting the specific census report, generally, the younger age groups hold the largest shares. 5. The age group 0-14 years constituted a very large proportion. The option closest to this young demographic is 5 to 14 years. 6. While the 15-59 working-age population is large overall, when broken into smaller brackets like 25-34 or 35-55, each bracket might be smaller than the broad base of children/adolescents (like 5-14). The elderly population (60+) was a relatively small percentage in 1991. 7. Therefore, the age group 5 to 14 years represented the highest percentage among the given options in the 1991 Census data.