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... If you dive past age 40 you might not be able to read it.
Safety in diving is often related to intended use and philosophy.
Does this mean that the button gauges do not have a vent valve on the back (or maybe side)?I'm 70 and can read mine fine. You just get lenses installed in your mask. I use them on my ponies and the only failure I've ever had was when the air monkey did a super fast hot overfill on the pony and blew the screen off. It still functioned but had a tiny leak so I just replaced it. Now I fill my ponies myself and haven't had another one pop.