When is it best to start using freckle care cosmetics?

Lately, I've been spending a lot of time in the sun, so I've naturally become interested in skincare products for freckles. I used to think freckle control products were for after freckles appeared, but these days, many people are using them as a preventative measure. I've heard that freckle control products are even more effective when used in conjunction with UV protection, so I'm considering incorporating them into my skincare routine. However, depending on your skin type, freckle control products can be irritating, so choosing the right one is crucial. I'm curious if anyone is using freckle control products regularly and when they started.