1. A Boy will find a Job.
A Man will find a Career.
2. A Boy will disrespect his parents. (Because he feels like he has something to "prove")
A Man will Honor his Parents and value the time he has with them while they're still living.
3. A Boy doesn't realize the damage his words and actions can cause, and doesn't care.
A Man chooses his words wisely and makes good decisions. (Has good judgement)
4. A Boy will let anyone make wise-cracks about his loved ones: family, friends, etc.
A Man will not allow anyone to bad talk those he loves in front of him. (Even if he has to leave the room, etc.)
5. A Boy will Lie - to anyone (family, friends. Girlfriend/Spouse, etc.) Usually because he simply doesn't have the Courage it takes to be Honest.
A Man knows that Honesty is the best Policy. He will always be Honest even if there are consequences.
These are only a few of the tell-tale signs between Boys and Men. Pay attention to the male's behavior and attitude, you will know within a week (or less) which one you have; a Boy or a Man.
I've been around since 1939, and the old saying is (if you plan on marrying a man):
"Watch the way a man treats his Mother, because that is the same way he will treat you one day"
And of all my years on this Earth, I've known this to be true.