How much can the average 175 lb man deadlift?

It depends. A 21 year-old former high school football player could probably deadlift 250-300. A 30 year old Systems Admin probably couldn't break 250. A 60 year old 175 lb man less than 150. I'm 22, weigh 170, and I max around 345-350 and I've been lifting for about 6 months if that helps.