Hindus touch feet of their elders to give them respect. It will help the receptor (the individual, who is bowing down) to reduce his or her ego. He or she is blessed with positive thoughts and energy that reaches him or her through the giver (the elder person whose toes are touched.)
When the fingertips of the receptor’s hand touch the feet of the giver then there is a circuit of the energy that is immediately formed between the receptor and the giver. The energies of two bodies are connected that connects two individual’s minds and hearts.