25 is the best age to permanently be in. This is because you are fresh out of college and still remember the things you studied. This means that you can do you’re profession that you studied pretty well and you can build your experience. You also aren’t having the “old person pains” and are still pretty young which means that you can do more fun things like go on cruises or go skydiving or even just running. My third reason is that you are full grown so you have already developed most of your muscles and have grown to you’re full potential which means that you have no growing pains.