What idioms are there to describe the spirit of the elderly?

There are some words, for example, healthy old age, enjoying yourself, crying, old-fashioned, amiable, old-fashioned, rejuvenated, kind-hearted and so on.

Definition of "Hé fà tó ng Yá n":

White fingers and ruddy complexion; Describe the old man with a good face and a healthy spirit.

Antonym:

Old.

Make sentences:

1, Zhang Laobo, who is over 70 years old, has a childish face, but walks like a fly.

Grandpa, who is over 70 years old, has a strong body and a good fist.

3. I still study hard in scientific research in my later years. It's really "an old horse crouching tiger, aiming at a thousand miles"!