Translation of "cheeriness" into Spanish

At 55 I've learned how to fake cheeriness, but there are not many opportunities for work anymore.

A los 55 aprendí a fingir alegría, pero ya no hay muchas oportunidades de trabajo.

Surrounded by a cheery group of young people, I keep a young and happy outlook.

Rodeada de la jovialidad de los muchachos, mantengo una actitud juvenil y feliz.