[sa-is]

No, 21 is not too old to learn electric guitar. One is never too old to learn a new instrument. In fact, learning an instrument at any age can be a very rewarding experience. It’s a common misconception that you have to start as a child to become proficient at an instrument, but this is not the case. Many famous musicians started learning later in life and have had successful careers. So, go ahead and start learning guitar at 21 or any age you feel comfortable with.