VHDL & Verilog. 29 and 30 years old respectively, and while not really programming languages (they're hardware description languages) but they're used quite a bit. Any piece of equipment with an FPGA or CPLD inside (more things than you'd expect) and for prototyping systems before going to the expense of creating custom ICs. While they're not as old as many of the other languages mentioned here they're old enough, and I haven't seen anyone else mentioning them.