I've had mine about the same length of time as you,and i only needed to replace my cover,which i also made myself.For a pad if you really need a new one and old_ wool blanket,or a piece of wool fabric would work well.I used to have a large padded ironing surface that i made for ironing large pieces of fabric and quilt tops,and i just used a piece of wool fabric and covered it with cotton fabric.Worked very well.
Kathi

I posted a similar question awhile back about my regular shower-gift (1978) ironing board. I got great ideas and advice here.

What I finally did was strip it down and spray paint the frame ivory. How does an ironing board get so pocked and rusty over time?

Then I put down a layer of silver reflective mylar. Over that I put several layers of cotton batting and covered it with a pretty cotton cover.

It's almost a pleasure to iron now.

I used an old mattress pad, doubled, cut to fit and have the best pad I have ever had. Better than the old boughten one. Jo

I, too, have one of those odd-sized boards that no standard cover fits and have used old mattress pads for padding. I like cotton covers the best and I generally use smooth, heavy drapery material. The one trick I did find when making covers is to cut two pieces, turn them inside out, press the edges, then sew a casing around the edge. This is much easier than trying to hem the edge. Then I thread a strong cord through the casing & pull it tight over the board. If the cover still isn't taut enough, I use those hooks that have springs in the middle & attach them to the underside along the edges. I'm attaching a link so you can see what they look like.

Here is a link that might be useful: Ironing board cover fasteners

Try a Jo Ann's with a great section of upholstery. They have the teflon quilted material..like potholders are made from. This is great for it helps the steam that comes from the iron go back up into the fabric and makes the press better. Try www.a1sewingmachine.com or www.sew4less.com, they have helped me find stuff. The material is also at Nancy'snotions.