Am I getting old?

In the last two years I have experienced more death than I had in the previous 26 years of my life. It started with Ian's dad a couple of years ago. It was pretty out of the blue and very hard to deal with. Then, a year later, my boss' wife was in a car accident and died, then Willow (my cat, yes, he counts too), then my Grandfather. Yesterday our neighbour passed away at the hospital. I took grief counselling courses when I worked at the vet clinic and learned how to help people through loss, but, I'm terrible at it, really. I have no idea what to do. Do I go to the neighbours house and offer my condolonces? If I do, what on earth do I say? I'm sorry just sounds so stupid right now. Don (the neighbour) has been in the hospital for several months now, so really, maybe it's a blessing that he finally passed, but you cant say that either. So, I sit here in my house, afraid to go out because I may bump into Don's son or his wife, and I have no idea what to say to them. I feel sick just thinking about what they must be feeling.