So let's see, I won't get much sleep and should get in shape... makes list.
I already considered the fact that I'll be 60 when the kid hits 16... yikes! Fortunately the missus is 8 years younger!
what a FUN thread!
and even more fun ahead for you, Da_Shrimp
We had ours later in life too, #1 at 40, then #2 and #3 at not-yet 42 for ole dad. If anything, I think they've kept us younger than our chronological years.
You may have a baby who sleeps through the night after a week or two, who knows? We had that good fortune, and I think it was because the babies were in a very tranquil environment. It became less tranquil as they grew (chaotic is more like it).
Don't let it bother you if people ask if s/he is your grandson/daughter. In fact, don't let anything bother you, you are being sent the most wonderful blessing you will ever know.
And, do keep in mind as others have said, that it passes all too quickly.
Best to you and the missus ... do let us know when your baby is born.