<human>: Can you give me the gist of the text in a nutshell?

Hey everyone - throwaway account, looking for some advice.

I am 23 and have been dating my girlfriend (24) for nearly 3 years. We met in college, and things have been going great. Since finishing school, our relationship has only improved. We both currently live in the same city and spend a ton of time together - while we live in separate apartments, we probably spend 3-4 nights/week together.

As corny as it sounds to say, I really am happiest when I'm with her. I love spending time with my roommates, but am always thinking about her when I'm not with her. We have talked about the future and both have said that we want to marry each other eventually - but it's always been a conversation set in the future, never necessarily something that is on the near horizon.

Most of the people I work with are older (~35), and always give me a hard time about how they got married too young, how I should hold out as long as I can, etc. It's mostly done in good fun, and I know that, but I really think they partially mean what they're saying. Could that be a result of problems in their own marriage that they're reflecting onto me? I'm really not sure - possibly. I've had friends my age got married, and our peers can't believe someone would ever get married that young. I would not at all consider myself the most mature of my friends or anything like that, but to me it doesn't seem like that ridiculous of a concept to get married at this age if you are confident that you've found the right person. 

I guess what it comes down to is this - If I know I want to marry her, and vice versa, what's the benefit of waiting? The common thing I hear from people is that you should wait until you're older, but why just put it off longer if it's what we want and will make us both happy?

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Not sure if this is worth noting, but we both have very good, stable jobs - so this decision is not being financially motivated at all.
<bot>: Everyone I know seems to think 23/24 is way too young to get married, but I feel ready. Is there any reason to put off proposing?