Is it safer to have titanium or stainless steel plate if 16?

Age is not an issue. Stainless steel is used commonly and safely for surgical implants. Titanium is relatively newer on the market in the manufacture of surgical implants and has properties that are more like bone than stainless. It is important for any surgery to notify your surgeon of any and all allergies to medications food and in particular when the case may involve an implant, metal allergies.