Lustron home roof

I have a Lustron home built around 1950 (here is link http://en.wikipedia.org/wiki/Lustron_house) It has procelain enameled steel tiles on the roof. The roof appears to be in good shape after 65 years although this year for the first time we had a problem with ice dams and leaks during our horrendous New England winter. I would like to have solar panels placed on the roof but the contractor is reluctant to put holes in such an old roof. I am debating whether I need a new roof. Is it possible I could have several years of continued use with the old roof without solar panels. Do you agree drilling holes for solar panels would not be a good idea.