More babies?!?

Lisa • Mom of 4 boys and one baby girl. Mom of a high-school graduate, preschooler in heaven, 3 year old twins and a 1 year old princess.
My babies will be 1 August 11th and hubby wants more now! I'm actually thinking maybe start trying, am I crazy?!? I don't want 3 in diapers but we're both getting older. He'll be 41 next month and I'm 35. 
Any opinions?