Most keyboard players I know range 50 to 80 years of age, but I'm sure there are some younger folks who are active on this forum, including yourself. I'll be 65 this October, and I'm not the oldest person here.

As for the adapter, they are known as DC to AC inverters, and most keyboards can utilize this device if the proper wattage rating is purchased. Pretty much anything over 500 watts is just fine.

Cheers,

Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)