When to buy RoA

I'm not too sure what the optimal time is to buy Rod of Ages, it's expensive so I can't buy it early game, and usually I want to rush other items when I get 3k gold, so when exactly should I buy it, in terms of time and total gold amount? Is it just an item one gets for a bunch of stats when there isn't a specific need the team has because they aren't being opposed too hard, but still opposed hard enough to discourage getting a Mejai, or are there specific situations for when I should get one (For sustaining poke-heavy champs, when against tanks, etc?)

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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