If you're not going to have kids, there's really no reason at all to get married. Unless she is loaded.
Having kids is the main cause of stress and strife in most marriages.
I never had 'em and never had a horrible experience getting divorced.
My wife and often joke about the sorry state of affairs most married with children are in.
I've seen plenty of successful men that marry a woman and she becomes a mom and everything changes.
Plus, you need to marry someone with an equal career.
For example, my ex-wife was a board certified psychologist with a PhD and good career.
When we divorced , we each took our car, sold the townhouse , had separate credit cards and split.
No hard feelings, no debt owed either way.
So why get married ?
Love , companionship and partnership.
My (current) wife is a senior VP executive of her section at a major bank
I was a college physics teacher and just retired.
We are both previously divorced and neither of us had kids.
By combining our assets were have been able to obtain more then being single.
Plus, she's my best friend and we love sharing a simple, wholesome lifestyle.
It's a cold , lonely world and it's nice to spend my life with a loving partner at my side.
For my wife and I , our lifestyle with marriage as loving, equal partners, works.
BUT, for those younger guys I'd advise against any form of traditional marriage with children.
Stay single unless you meet a decent woman you're attracted to , who can also be your best friend.
AGAIN, don't have kids unless you really feel called to be a parent.