I've been patching up my 10 year old jeans. He can make a hole in a knee as soon as he puts them on.
I've patched up many of his jeans 2 or 3 times. Some have patches on top of patches because he made a hole through the patch. This kid plays hard and his jeans know it.
Anyway, I bought some thicker twill with awesome boy themes on them. Took it home and got started on re-patching 3 pairs. First I had to cut it out and then I did a rolled hem on the edge of them so they wouldn't fray. I then ironed on the applique bonding to the wrong side.After I peeled it off and ironed them on the knees , I sewed around the patches both by machine and by hand. I am hoping these will last a few months.