Old vs New Accounts

[Durry]

I'm new to botting in osrs but i have been doing it pretty constantly since i started 2 weeks ago and was hoping to spark some conversation about 'new vs old accounts' i understand if this has already been discussed but i havent found any topics.

So getting into it i found a script to use that ran pretty well and thought i would try get a little gold farming to use on my main. I ran this script pretty hard using it for about 6-8 hours a day with some small breaks in between (I knew this would probably cause faster bans but was/am fully ok with accounts being banned). I found that on new accounts if i only ran the script for making gold then logged out i would get banned before the next day, so i started botting some random skills e.g sandcrabs,firemaking,fletching pretty much whatever was easy and the accounts started lasting 4-5 days each. But i had two accounts that were around 2 years old that i have been botting at the same time doing the same methods which havent gotten banned. Last night 3 of my accounts go banned all at the same time (two accounts at 11:37 and one at 11:46) but my two old accounts did not get banned even though they were botting the same thing on the same ip (yes this is bad but i don't want to buy separate proxys till i figure out a efficient way to bot). I have also had another 5 accounts banned that lasted between 2-5 days botting at the same time as my old accounts. I know this is a small sample size and a small amount of time but i thought it was enough.

Pretty much what i'm trying to ask is how can my two old accounts last what has been 14 days now but my new accounts cant last more than 5 doing the dame thing?

[Juggles]

Natural selection.