Lutz is a good kicker and will continue to be a good kicker well into his 30s. But if you look around the league, good kickers tend to move around in their late 20s and early 30s. Unless you have an elite kicker, most kickers will be kicking for a different team at some point. There's probably only a handful of veteran kickers who are still with their first team in the league.
Is Lutz elite? I think there's a good chance he is and I feel that last season was a down year which every kicker will have. Would I keep him? Yes because he is a proven ice cold game winning kicker and those are hard to find.