Buy a bigger monitor. Or get glasses. I'm 38, rocking a 43" 4k monitor. There's so much room. Scale things up or down to your comfort level. It's a pleasure if you use an editor like atom.
We should be focusing instead on the contextual and cognitive pros and cons of various line lengths.
There's no more room on a 43" 3840 x 2160 monitor than there is on a 32" 3840 x 2160...
The refresh rate might be slower, so of you get annoyed by a 30Hz refresh rate, you'll want to make sure the TV does 60Hz.
Nowadays I'm guessing anything but the cheapest models can do it for any given resolution, but some diligence is probably in order as TV specs are not as uniform and reliable as monitor specs.