expression
man flourishes with age
Proverb meaning that one should grow more vigorous and active as one gets older, rather than decline.
祖父は「老いては益々壮んなるべし」と言って、毎朝ジョギングを続けている。
My grandfather says, 'Man flourishes with age,' and continues jogging every morning.
A classical Japanese proverb using the literary auxiliary verb べし. The exact origin is uncertain, but it reflects a traditional ideal of staying active in old age.