By the time you reach your 60s and 70s, Sherer said, alcohol “functions heavily as a sedative,” and your aging body “simply cannot process” as much alcohol safely. Trautman noted “a more consequential effect” on balance, reaction time, blood pressure, cognition and medical safety.
Article source: https://www.huffingtonpost.co.uk/entry/alcohol-makes-you-more-tired-ageing_uk_6ab507d9e4b07a6b099298b7