You don't remember the first few months of hard times with the older ones because hormones + sleep deprivation is either God or evolution's way of tricking you into having more kids.
It really does get better, but on the newborn's schedule. 2-3 months, maybe?
One thing that really helped us with our closer-spaced four is to get the older kids involved as much as possible in taking care of "their" baby. A three and a half year old is more than capable of fetching and doing all sorts of things - some of which you actually need, and some of which are make-work - and it sets them up as having a proprietary interest in their brother.
Anonymous wrote:I don't understand what your husband's age has to do with anything?
The snark against stressed-out new mother OP seems rather uncalled for, but to answer your question: genetic load increases with paternal age, and energy drops. Oldness isn't just an issue on the distaff side.