I don't think there are really any downsides. I can type in both Dvorak and QWERTY at over 120wpm and don't have any trouble switching between the two. I also use QWERTY on my phone, so maybe that helps a bit.
Dvorak is definitely superior to QWERTY comfort-wise (I used to get bad RSI with QWERTY, but that doesn't happen for Dvorak), and maybe speed-wise, though my speed in both is about the same. I can keep up a high rate of speed on Dvorak longer than QWERTY, though.
An an aside, I don't think you're ever too old to try something new. I learned Dvorak as an adult and it only took me a couple weeks before I was up to my QWERTY speed. Interestingly enough, after I learned Dvorak my speed with QWERTY actually increased, for whatever reason.
Dvorak is definitely superior to QWERTY comfort-wise (I used to get bad RSI with QWERTY, but that doesn't happen for Dvorak), and maybe speed-wise, though my speed in both is about the same. I can keep up a high rate of speed on Dvorak longer than QWERTY, though.
An an aside, I don't think you're ever too old to try something new. I learned Dvorak as an adult and it only took me a couple weeks before I was up to my QWERTY speed. Interestingly enough, after I learned Dvorak my speed with QWERTY actually increased, for whatever reason.