Domain Age affects PR?

I can say not much affect since PR is based on the backlink, not age

 

If domain is old, google comes more often, than he comes to young sites - this is domain trast

 

pr is not connected with age. buy an old domain with pr. start it with complete new content. u will loose ur pr & serp
what matters to google is backlinks & quality content. obviously if u use a domain for same purpose for several years u will gain much content & a brand value that would make other sites to link to u.
thats why ur pr & serp ranking usually get higher with time.

 

if your domain is quite old chances are that more peoples may have seen it and more peoples might have linked your posts .. So older your domain is better you are .

 

Domain Age do have a effect on SERP and other things.. but not in PR.
Its solely depends on backlinks and the quality of the content.