Some people say you should keep romance in your marriage by staying fresh, vibrant, mysterious, unpredictable, surprising!
Actually, there's a lot to be said for predictability. Been married for a little more than three decades. Hasn't been all sunshine but we've weathered the storms and very much enjoyed the rainbows after the rain ... uh ... the floods ... the deluge!
The older you get, the more you appreciate the "expected comfort zone", i.e. habits (or peculiarities) developed over years and years and years of living together.
Like enjoying personalized jam sessions every Friday night!