My father was almost 50 when I was born. Mum was in her early thirties. For context, he was born in 1910 and was basically a Victorian in his attitudes. He died of cancer when I was eighteen. As others have noted, you can die at any time.
I would not have had it any other way. He was old fashioned, could be quite stern, but always open to a robust argument. He could be hugely embarrassing in all sorts of circumstances, but hugely protective and stupidly proud of my very small achievements.
He was also an astute judge of character, and if he had still been alive he would have taken one look at the bloke I married, been polite, but growled in a corner, and I'd have saved myself from more than twenty years of an abusive marriage.
I loved him to bits. Despite his antiquated ideas of parenting (as I thought at the time) he left me with a healthy sense of who I am, and a resilience which has been tested and not found wanting.
If your man is right for you, and you want him to be the father of your children, I would say from my experience of my own particular older father, go for it. The age isn't the issue, it is about the particular person. I would have loved my Dad to have been around for a lot longer, and to have met my kids and have been part of their lives, but I'm so glad I had him for the years I did.