As long as they have a plan and can support themselves, I'm okay with any age. (Easy for me to say, my kids are 17 and nearly 20 and we haven't had a date yet.

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But, DH and I married at 22. I was fresh out of college and working my first job, he was fresh out of the Marines and starting his first job with no degree. We had our first child at 24 and our second at 27. We are pushing our mid-40s and have an almost empty nest. Being younger when we married was never an issue. If we wanted to travel, we traveled. We had a small "dead zone" when the kids were super young (under 5), but once they were old enough, we just brought them along.
While we both have friends (our own and a few couples we associate with together), we were never really the "travel with friends" type. (He went on one friend trip, I've been on two that I can remember.) We do travel with family (brothers or sisters) from time to time.
And we are definitely not the "travel the world" type. We enjoy simpler pleasures: camping, going to the drive-in with friends, dinner out with our parents, and going for a ride on the motorcycle. We take a vacation every couple years, camping or beach or museums and theme parks are our preferences. Our age at marriage never put a damper on any of those, and of course we could do that on any budget, even a 'starting career' budget with two kids.
Even a degree is no guarantee that life will follow the path you set. I had a degree before marriage. I ended up hating that career, so I worked in another field (with an associates degree I earned on weekends) for 16 years. Then at almost 40, (with two teens) I went back to school for anotherdegree (RN) and am working in that field now. I could never have survived this job at 22, I was way too high strung and nervous. I would have cried daily. lol. I've built up my confidence and backbone through a lifetime and now it's such an awesome job and I love it! Life can change and as long as you have a supportive partner, you can go through anything together just as easy as you can when single.