What Am I Riddles

Question: A man shaves several times a day, yet he still has a beard.

Who is this man?

Question: You may always chase me but you are always about 3 miles away.

What am I?

Question: A dad and his four boys stand in line.
All crowned, they toil in darkness.
Another family they see, two birds of a feather.
All of them together clad in leather.

What are they?

Question: Some use me, while others do not.
Some remember, while others have forgot.
For profit and gain I'm used expertly, I can't be picked off the ground or tossed in the sea.
Only gained through patience and time, can you unravel my rhyme?

Question: What goes back and forth constantly, but never in a straight line?