Congrats Sharky!
That will be a nice age difference - my sister and I are almost 6 years apart and while we didn't have that much in common growing up (she was always in my stuff - we had to share a room!), we are the best of friends now and are raising our kids together... well, mine babysit HERS - lol But it's fun being so close and being able to give her advice & support.
*sigh* Those baby years... I miss them... I'll be waiting on grandchildren now at this point before we have another bouncing baby in the house. Enjoy! It flies by FAST!