There's a difference between aged PR links and an aged domain. I've had several sites get good PR with only new (less than 4 months old) links, and it's always about quality over quantity. The person with the PR0 site and 100 backlinks illustrates that point. My high PR sites (PR4+) ALL have just a few backlinks, but they're good ones. Don't just get a bunch of links for the sake of having them.
in my site i started work on march and this site got pr in april i.e. 3 pr (from 0 to 3 ) now my site is banned in google so it will affect my sites pr please suggest
your site is dmoz listed and still sandboxed? do you have insider ties in DMOZ haha it takes me from a year to 2 to get a site listed in DMOZ and by that time sandbox is gone. answering your question - i dont think increasing link popularity by acquiring many links fast will do you any good - on the contrary it can ban your site for life! sandboxed domains are VERY PRONE to lifeterm domain bans for overoptimization.