What discipline?
You post on sherdog, brah?
I'm coming up on 39. In my mind I don't feel any older than I did when I was 25...just much smarter. Of course, the body tells a different story.
For me, ages 0-20 seemed like an eternity, while 21-38 felt like an instant. It's amazing how much more quickly time seems to be going by as I get older. College seems like a recent memory, and it feels like I just turned 30 a couple of years ago. I understand now why younger people don't seem to understand when people talk about how short life is. When you're 15 it seems like life is long. By the time you're in your 30s you begin to realize how short a ride it is. It's a little unnerving.
That's pretty much what a former client said once except he was much more depressive following along the lines of "my life will be over and I'll be dead before I know it", think it was getting to him. Yes we are only here for a short time but don't let the time you do have be ruined by that thought.
Certainly not. All the more reason to avoid taking anything for granted or allowing trivialities to bother you. It's actually liberating in some ways.
Life starts changing pretty quickly now that you are 20. A few years ago, I felt like a kid living on my own with no real responsibilities except grades. Parents payed for my tuition, apartment, car, food, etc. and my only concern was where the party was that night. Being 20 is truly a miraculous time. All the fun of advlthood with none of the responsibility. Undergrad is truly the most fun part of your life.
The transition to becoming a "real" advlt comes in a flash. You don't feel any different than you did in high school or undergrad, but you find a way to get things done.
Just last week I had a woman ask me if I was 18 yet as I was performing a partial nail matrixectomy on her. I didn't tell her this, but I do still feel like I am turning 18. In the blink of an eye, your level of responsibility changes from "do I have enough quarters to do laundry" ..... to "which surgical technique do I want to use to normalize the biomechanical function of this guys foot".
Embrace it. Roll with the punches and keep moving forward.
In less than a year I can say I will be a quarter of a century old. I think that is kind of cool. I have lived a lot in my short amount of time so I am not really worried about it. I would hate to die tomorrow, as I have a lot I still want to do, but I don't think I would be terribly regretful or anything as I have lived what I have pretty fully.