pin-pin
Describes someone who is full of energy and in excellent health. Often used admiringly for elderly people who are still vigorous.
💡Talking about grandma — 'She's 90 but still pin-pin healthy!'
おじいちゃんは90歳でもぴんぴんしている。
Grandpa is pin-pin lively even at 90.
Despite his age, the old man is still ___ and walks every day.
高齢にもかかわらず、おじいさんは○○していて毎日散歩する。