There is no problem when it comes to age. Just make sure that the percussion massager settings are right and comfortable. This is not a gentle massager, deep means it hurts, but in a good way. Like Shiatsu, it could bring tears to your eyes. It definitely relieve the most stubborn of knots. Hope this helps.
David T Allan: I guess it depends on your definition of "older". I am 52, and use it on a regular basis. If I was in my 70's, I expect I would still use it, but likely with less pressure against the muscles...
PLENO massage gun's plug is 100-240 V and is compatible internationally. If you order from our international partners, it will include the correct charger for your country.