hi,

in general there is no maximum age limit for doing b.ed course. b.ed course is 2 years duration course. most of the university need at least 50% marks in graduation for appear in b.ed admission. but the criteria is different for different institution and also depends on category of students. however you may know about b.ed colleges and their criteria from below link:

https://university.careers360.com/colleges/list-of-bed-universities-in-india