Gosh, 21 was old when my Mom was a girl but certainly not in the 21st century!! In fact, I think 21 is really young to get married. That was the age I got married and let me tell you I didn't even know who I was let alone learning about my husband!
We're still married but we sure had a lot of growing pains lol
My kids are all still single and they are older than you and I'm glad. They have plenty of time!