Yep, it's totally normal. The first year is always the best, then it slows down after that, usually.
I remember having this conversation with my friends and their husbands only a couple of weeks ago. The women were complaining that they only get it once a week, and the guys were like "So?" Their excuse was that they're 'tired'......but I really do think male sex drives wane as they get older. Women, unfortunately, get hornier. Very unfair.
Live as if you were to die tomorrow. Learn as if you were to live forever. - Mohandas Gandhi