Who is 'them'?
Also, we will all be newbs when we first start the game.
But the decision is really up to you to make. Are you bored of FFXI after 5 years of playing? I would imagine you have, at the very least, 1 level 75 job (if not several). If you aren't bored of it yet, I can't really blame you; it's a great game, but sometimes change is good.
Did you enjoy your experience in FFXI? Going on quests, getting stronger, exploring new areas, getting rare items...do you want to relive those memories?
Or if you're fine where you are in FFXI then just stick with it.
And asking whether 14 will be better is purely subjective. It will only be better for you if you think it is.
Toasting makes me uncomfortable. But toast I love. Never start the day without a good piece of toast. In fact, let's toast to toast.