Hinduism (Vedas) sets 120 years as human lifespan (provided it is lived according to dharma, transgressions reduce it a proportionally). That's where all other religions got it form.
That's very interesting if true. Can you give any reference? All I can find through search engines is some references to "about 100 years" and a single thread where someone mentions a 120 year prediction but then the rest of the thread is everyone else correcting that person.