A girlfriend is not the way to go.
Get that out of your head right now.
Escorts are for sex any time you want.
So you meet a girl, two years of great sex then that's it. That's my experience anyway. After that you are lucky if you get it once a week.
If you marry her you will be lucky if you get it on your birthday.
I am nearly fifty. I own all my assets still. In live in comfort. All my mates from back in the day who got married now live in poverty or misery.