Well, seeing that I had my first at 37, I would say, no, it's not too old 
I was 37, 38, 42 and 44 for mine and all was well re pregnancies, deliveries and looking after them.
There are so many of these threads and I really don't think that there is 'right' age to have children, only a right age for you.
Re fertility : we are at our most fertile in our late teens/early 20s and there is a gradual decline after than. There is no 'fertility drops off a cliff after 35' - it's widely reported myth.
If you are keen, your DH is on board and it's right for your family then there's no reason why you should not try.