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There are many way to simulate age, but with dots is not one. They are sharp and solid and that doesn't help. Now, I'm all for artistic freedom and if that polka effect makes you happy by all means go for it. But as a ageing filter it doesn't work. I admit it's a easy way to hide the main problem with making digital composites, namely to match the chroma/luminosity of two seperate images. I know, takes a ton of adjustment effort for two images to seamlessly integrate with each other, even when using the most advanced matching filters in PS
I found usefull this workaround in Photoshop. It's written with RAW format of digital camera in mind but works as well for regular images.
https://www.photoshopessentials.com/photo-effects/old-antique-photo-effect-camera-raw-filter/