baby fever

I'm 37 and my husband is 46. We have 7 kids he has 4 and I have 3. We don't have any together yet. I had my tubes tied after I had my 3rd child but she will be 16 in September. So we have decided not to do the reversal surgery because of the amount it costs. But we really want a baby so we are really trying putting all of our faith in God that he will bless us with a baby or twins.