Three Quick Questions vs The Enjoyment of Photography

Great Bustard wrote:

Equivalent photos have the same perspective, framing, DOF, and shutter speed. The consequence of this is that the same total amount of light is projected on the sensor. Thus, if the sensors are equally efficient, the noise will be the same.

However, often there is enough light so that the FF photographer can achieve the same DOF with a lower shutter speed, thus putting much more light on the sensor, and thus less noise. Alternatively, the FF photographer can use a more shallow DOF for a given shutter speed, if the more shallow DOF is desirable, or, at least, more desirable than the higher noise. The consequence of the more shallow DOF for a given shutter speed once again projects more total light on the sensor, and thus less noise.

So, if you see FF photos having a noise advantage, it is because the FF photographer is taking photos that are not Equivalent.

Hopefully, that answers your questions without being overly technical. By the way, I have to ask: older than what?