well-preserved

[wel-pri-zurvd] /ˈwɛl prɪˈzɜrvd/
adjective
1.
having been maintained in good condition; preserving a good or healthy appearance:
a well-preserved manuscript; a well-preserved elderly couple.
Origin
1850-55
British Dictionary definitions for well preserved

well-preserved

adjective (well preserved when postpositive)
1.
kept in a good condition
2.
continuing to appear youthful: she was a well-preserved old lady
Idioms and Phrases with well preserved

well preserved

Aging gracefully, still in good condition, as in I can't believe she's 65; she's certainly well preserved. [ Mid-1800s ]