Hey Aspirant , the age limit of Central armed police forces for a genral candidate is 20 years to 25 years , that is the candidate should not be less than 20 years and more than 25 years . There are seven security forces which come under this nomenclature . Some of it are
1.CISF
2.CRPF
3.Indo Tibetan border police
4.shastra seema bal
All these forces are very extremely important to ensure internal security in the country . All the best , hope it helped.