The earlier you start the better, seriously google retirement investment age charts and see the power of compounding interest, it's INSANE.

This was one of my no.1 reasons I would go with Job no.2 , they're giving you free money for something that when you're young you (like you indicated) are typically not very interested in but NEED to be, so they do it for you which is the best way to do it, out of sight out of mind and doing work passively for you.