S.K.
Okay, so I know that there will probably be people who disagree with me, but if this is your husbands first marriage and only kids I believe he was too old to start having kids. I know that there are a lot of people who have kids later in life, for all different reasons. But the problem is the older we got (and longer we go without having children) the more set in our "own" routine we become (ie - we become more selfish and self centered). Your kids are very young, and it sounds like he has been doing things his way for 40 some odd years. It's going to be very hard to change those old patterns of living (and I think because men don't have that "maternal" instinct going it's a lot harder for them than it is for us women). I think marriage counseling would be a good option for the two of you. Your husband needs an outsider to tell him how important it is to spend time with the kids.
I will say, on the flip side, there are many of us that would love to have a husband who got things done around the house without us having to nag them ;). But there does have to be a balance. I will also say that you are not alone in feeling the way do. I often feel like a single parent and my husband is younger than I am (not even 30 yet), but he was an only child and really never had to share anything with anyone. His mom swears she didn't spoil him, but I would tend to disagree. He can be very selfish at times. What I finally ended up doing is joining a Bunco group and leaving him with the kids on those nights. I also make sure I go do a few other things each month so that he has that time with the kids whether he likes it or not...haha!
anyway, hope this helps :).