Seems there isn’t one for Windows yet, but Audacity is 64-bit on Mac and Linux.
Please make a 64-bit version of Audacity, even if you drop the 32-bit version, it would be better to be 64-bit only than 32-bit only. Very few systems are 32-bit anymore and I would like to run as little 32-bit software as possible - I don’t believe that new software should be using old standards.
Eventually that will happen… See [u]this post[/u].
I would like to run as little 32-bit software as possible
I’m just a user, not a developer but IMO, that’s not a very compelling reason to “change everything”. I don’t know if it will make any difference in “user performance” but I wouldn’t think so.
GoldWave ($50 USD) is 64-bits. 
I don’t believe that new software should be using old standards.
Microsoft still sells & supports 32-Windows 10 so it’s not “old”.
If running 64-bit only plug-ins is the issue, Audcaity’s (free) competitor OCENaudio will do that,
(but it’s not as capable as Audacity).