I don't remember my age at the time, maybe around 10. My birthday is December 2nd, so I asked my parents for a combination birthday Christmas gift of an electric guitar and an amplifier. They got me a cheap "Grandpa Pidgeons" guitar, probably around $40. and a Fender Pro-Reverb Amp. Nothing special, but enough to get started. I later saved for an Elektra Omega, then finally a Gibson Goldtop Deluxe LP. That is all gone and replaced with my current Gibson LP Classic Antique and Peavey Classic 50 VT Series amp.
But, my very first guitar was an unknown brand small acoustic that I paid $1.00 for from a friend down the street. I played Smoke on the Water on the 1st string only and the rest is history.