Till which year the oil reserves in the world will continue to serve us ...?

estimates are that they will last 30-50 yearsTill which year the oil reserves in the world will continue to serve us ...?
40 years maxTill which year the oil reserves in the world will continue to serve us ...?
reseves? i dont think that long... but theres ALOT of oil in the world they just aren't taking the time to look for more, they're just using the same thing and jacking up the price. damn monopolies.