If aging baby boomers are such a big buying block, why are gadgets being made smaller and black?

Casperia asked:
Many of us who are 50 and over don’t see as well as we used to, but gadgets have increasingly small texts and number pads. Black is the favored color - it blends in with everything and you can’t find things. What’s with manufacturers? Are bright-eyed teeny-boppers with skinny little finger [...]