Not sure if you want to add in whether the bots have a delegation service with a return on delegations, but these ones (that I could find) do: smartsteem, jerrybanfield, boomerang, booster (through frontrunner), minnowhelper, msp-bidbot
For age limits:
appreciator, upme, voter, upgoater - post cannot be older than 6 days.
minnowhelper - post cannot be older than 5 days
hellowhale - post cannot be older than 2 days
I certainly may have missed something trying to comb through the blog posts.