Tough one. Requires effort on your part - or on hers. Women fall into the same trap all the time too.
Set up surprises every few weeks, on an irregular basis. This is supposed to be fun, not another chore for the diary. It is fairly hard to do that after a while in a relationship, but is well worth the effort. My favorite is a post-it note on the kettle for when she gets up, saying what to wear and when to be ready by. And we go out somewhere. Anywhere from a 5 star restaurant, to a gig, to a movie, to a tractor pull - she never knows what is going to happen when she gets into the car.
If the household routine is getting blah, turn it up a notch. Make her breakfast in bed. Have a pillow fight. Plant some flowers (and watch them wither and die, in our case). Buy her a present - "just because." Ravish her unexpectedly. Anything to get out of your comfort zone - that grey monotony of habit - and get her out of hers.
A person should never be a habit. They rate far more respect than that. And remember - you are only as old as the person you feel.
Did you mean, "you are only as old as the person you feel" this literally or figuratively? lol
You know me too well.