>>>If the business is something you are passionate about, the hours and effort won't seem like work.<<<

Mark Twain once said, "work is what a fellow is obliged to do". If you treat your business as a hobby, it's not work.

>>>The satisfaction gained from running your own business sees many continuing to work well past normal retirement ages, while for 9 to 5 employees retirement cannot come soon enough.<<<

And then when employees retire, they don't know what to do with themselves and the stress ages them quickly.

Most businesses have a way of winding down naturally, so retirement is less abrupt.
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Edit: Thanx Toxic for my 3000th merit. It was a while coming.