Related Clues:

• Nimble and quick
• Pretty agile for one's age
• Quick-footed
• Lively, perhaps for one's age
• Frisky
• Quick-moving
• Like a certain Jack
• Dextrous
• Not showing one's age, in a way
• Youthful
• Surprisingly limber
• Quick and nimble
• Full of vim
• Surprisingly agile
• Like a little old lady in tennis shoes