Here's a marriage challenge for you: the person you marry will transform into a significantly different person over time.
They will age. Their interests will shift. They will mature, but not at a predictable rate. Life will smack them around a little bit and that will change them. Your love itself will transform them.
A healthy marriage requires people to re-connect and re-engage over and over again throughout their time together. And doing this while juggling work and children and the Sturm und Drang of life will always be a challenge.
But it's worth it!