I have some website's in the same niche and they are all in Dutch language. I cannot find decent back links for them. Just I few, but not enough to boost them good. So I started to buy some aged domain with a PA of 35+ and put some content on them. Is it smart to put from that site's 4 links to my different money site's (all same niche) and mix them up with 2 a 3 links to other site's. Do you guys think I leave footprints with this kind of linkbuilding?