These tires, like most high quality tires are probably of "colle a main" construction. In this method the tread is molded separately from the tire and glued to the built tire. The advantage is that the fabric tire plies aren't heated, the drawback is that the glue can fail, leading to separation, usually along the edges, where water and UV can weaken the bond.

Most long time riders of top end tubulars are used to this, and will carefully reglue good tires if their overall condition warrants the effort. But, given the age of your tire, I'd thank it for the long service and give it a decent burial.

BTW- looking at the damage, I have a question. This isn't by any chance on a fixed wheel bike you "skip" to stop, is it? The intense shear loads of this type of hard braking can delaminate colle-a-main tires prematurely.