It wont be banned because of age. What the person was likely insinuating is that alot of sellers sell hacked aged accounts, so it's a chance that they'll get banned or taken back. But as far as them being banned just for being aged.. no truth in that. The only accounts I use are aged accounts, and I'm running hundreds them, so if that was the case I would be wasting money.
As for accounts, its not just about the warm process so much as it is how the account was created, the proxy it was created on, and the proxy you're running it on. Everyone has their own warm up settings, but just to prove my point, I warm up all my accounts starting at between 75-90 follows a day, and increase every few days, and have been using the same technique for a few years without any issues. I'm not telling you to repeat this, as you wont be using the same proxies nor accounts that I'm using so its likely you might have different results. But I buy aged accounts typically from 2 or 3 different providers, all which you can find on the forum, and I only used aged accounts.
I've do the same with accounts that I've created myself, as I know they're being made properly and from a clean 4g ip, dont experience any issues. Only way to really know, is like with anything else, you have to try yourself with your own variables, with a small batch. When you find what works, then scale things up.
