Chiron avoids his 20th birthday to encounter some homeless guy who gives him a seed that can "stop anything from changing". He impulsively throws it in a pond with himself included, improvising a fountain of youth... More like fountain of adulthood; the seed did the opposite of what it was described as, and our birthday depressed old man seems to be aging 10 years every month.
Trying to live it to the fullest, he and his friends are searching for a way to stop this curse.
CakeyMoon