In a word, yes. The system is well-beyond a safe age to do so since the memory retention battery is likely shot. While I'm hoping not, a weak or failed battery would allow some or all of your system's programming to be lost.

Using the reset button is a bit safer since it is essentially a "warm" restart, as opposed to a full power-down. At least what you did didn't remove power from the processor, so there may be hope.

Sadly, there has been quite a bit of discussion here over the past few years about this. I wish that you had seen this first!

Ed Vaughn, MBSWWYPBX