Hi aspirant,

See if you have done BTech from a good college and have relevant skills and knowledge about the thing concerned with the companies then your age would not be a major factor because all the companies prefer quality over quantity. The Google organises GSOC  to hire candidates who have done engineering and have relevant skill in off campus mode so here you see there is no measure pre requirements and the company only once people who have skills, knowledge and can be an asset to the company. Similarly if you do engineering from a well recognised college there would be at least 100 companies coming to the campus for placements so you would have ample opportunities even if some companies put age restriction. The major point is also that there is no retirement fund given now by the companies so there is no no problem in contrast to is for companies because they had to pay the amount only for the period the employee works for them.

Hope it helps!!