if someone started working at 20 and retired at 70, how big would their 401k be if they maxed it out? for 50 years they put as much money as the law would allow. each year for 50 years they made about 50k annually working as a bricklayer. they never had kids and never got married. how big would their 401k be after 50 years if they decided to max it out? i think that uncle sam puts a limit per year which i think is like 18 or 20k annually or something like that. would their 401k be like 3 million approximately or more? can someone please help me here? thanks.