Plastic gas line was brand new 25 years ago, most leaks are from
rusting in metal lines, that go unnoticed till something bad happens or
the stink is noticed which is why the odorant is there.

the big thing about gas leaks is they follow the lines so in the mddle
of the street gains little.

myself I would rather have plastic perhaps encased in a heavy outer
cover like 4 inch PVC sewer line for mecanical protection