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When the user indicates they are looking to buy bras for women over 50.

so you would keep user input forever without any personalised prediction forever?

Like we did before Facebook. Find sites that are relevant to my target audience and target those.

At least that way, if done right, you won't be simply invisible to half of the internet users.

First of all, what makes a bra only suitable if you are over 50, other than discrimination?

You can always find an example of a product that is easier to sell to a specific niche group of people. That doesn’t give the advertiser the right to know that fact about everyone. For the specific case of bras - how would you sell bras for women with large breasts if you don’t know who has large breasts? Do you think that slight inconvenience on behalf of the advertiser should give them the right to keep a database of everyone’s cup size?

>First of all, what makes a bra only suitable if you are over 50, other than discrimination?

Breasts tend to sag with age. As natural elasticity declines, a woman may require additional support.