We can thank the Germans for the soulful sound of the harmonica. Inventor, Christian Friedrich Ludwig Buschmann created this little gem back in 1821 when he was 16 years old. Invented for the entertainment and sound but with little regard to the fact that this "mouth organ" is also good for the circulatory system, increasing lung capacity, lowering blood pressure, and reducing overall stress.
Researchers found that learning to play a musical instrument lights up the brain in several areas and can enhance verbal memory, spatial reasoning, visual, auditory, motor areas, and literacy skills. Studies show playing an instrument makes you use both sides of your brain, which strengthens memory power. Training at a young age for more than 15 months can actually restructure the brain and it’s functions. As we age, neuroplasticity in the brain declines but does not stop. By continuing to learn new skills as we age, we slow the aging process. So next time you go to purchase that anti-aging cream for your face, think about what new skill you can learn to prevent aging of the brain.
Learn a musical instrument you're able to take anywhere with you. The harmonica fits into your pocket and is easily practiced in most settings. 
New 2020 Upgraded Version Swan 24 Hole Octave Harmonica Key of C with Case

Tone: C
Number of Bores: 24
Model Number: 24E
Cover Material: Chrome-plated Copper Board
Body Material: Ti-Plated