Well, I certainly don't think it should be a law of any kind, and I don't mean to imply that young marriages never work out.
That said...
...Yes. Yes, you should.
People continue to change and mature and learn about themselves long past the age at which they could legally marry, and very long after the heady combination of hormones and emotions kicks in and tells them that they will be madly in love for ever, no matter how unsuitable their would-be mate may be.
By 25, on the other hand, most people have had enough dating experience to at least know what they don't want. If I had married at 19, like my mother did, it would have been to the man I was head-over-heels for at 19. So I'd've been legally tied to a manipulative abuser...much like my mother was. At 25, I have that experience plus a few more, and I can make a more informed decision (just as she did a bit later, incidentally).
If we are going to insist on making our own decisions in an area this important rather than relying on the combined wisdom of our families to arrange appropriate marriages, then we should at least be at an age that will allow us to choose well.