Stale Bot for Old Issues and PR's?
https://probot.github.io/apps/stale/

cc @pandas-dev/pandas-core 

(looking at you @jreback in particular, given the herculean task you periodically undertake of closing and pinging stale PR's for further work or rebasing)

xref [PR Management Email Chain](https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/pandas-core-team/yCQ5GA3jzpg/LXB9WYAcAQAJ) (internal)