Whenever I interviewed (this was a long time ago) I would always take control of the interview. So when they would ask me about my prior projects, I would go on and on about them, enough so the person had a pretty good idea I knew what I was talking about.
The best antidote for being over the hill I have found is I usually ask friends first if they have any openings. They usually do and they will vouch for me. I also stick around a while: 6.5 year and 8 years for the last two. I make sure I push for new technology projects and make sure I do a good job so I'll get more. I really find the recruitment process distasteful.
A college friend of mine gave me the best advise for starting a new job. The first task they give you, make sure you bust your ass to get it done fast and well. That will set the tone.
Underrated advice.