Acceptable age to get engaged/married?

So I've been with my boyfriend for nearly a year now and he has told me he has bought an engagement ring of course to which I was absolutely thrilled and all that mushy love stuff :') I mentioned it to my mum and she said "you're too young etc". I'm 19 years old but if we were to get married it wouldn't be for another 2-3 years so by then I would be 22/23. So my question is what would you say is an acceptable age to get engaged and married? Because there is apparently an age too young yet my grandparents who have been together 49 years got married when they were merely 19 years old themselves.

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